Fix Sphinx reference warnings in various `Doc/library/` files

Doc/library/ast.rst:50: py:class reference target not found: ast.stmt [ref.class]
Doc/library/ast.rst:50: py:class reference target not found: ast.expr [ref.class]
Doc/library/ast.rst:66: py:attr reference target not found: left [ref.attr]
Doc/library/ast.rst:66: py:class reference target not found: ast.expr [ref.class]
Doc/library/ast.rst:93: py:class reference target not found: ast.expr [ref.class]
Doc/library/ast.rst:93: py:class reference target not found: ast.stmt [ref.class]
Doc/library/ast.rst:107: py:class reference target not found: ast.T [ref.class]
Doc/library/ast.rst:109: py:attr reference target not found: T._fields [ref.attr]
Doc/library/ast.rst:2221: py:class reference target not found: ast.operator [ref.class]
Doc/library/ast.rst:2221: py:class reference target not found: ast.unaryop [ref.class]
Doc/library/ast.rst:2221: py:class reference target not found: ast.cmpop [ref.class]
Doc/library/ast.rst:2221: py:class reference target not found: ast.boolop [ref.class]
Doc/library/ast.rst:2221: py:class reference target not found: ast.expr_context [ref.class]

Doc/library/asyncio-extending.rst:24: py:class reference target not found: asyncio.BaseEventLoop [ref.class]
Doc/library/asyncio-extending.rst:27: py:class reference target not found: asyncio.BaseEventLoop [ref.class]

Doc/library/importlib.rst:357: py:meth reference target not found: get_resource_reader [ref.meth]
Doc/library/importlib.rst:362: py:meth reference target not found: get_resource_reader [ref.meth]
Doc/library/importlib.rst:719: py:meth reference target not found: Loader.create_module [ref.meth]
Doc/library/importlib.rst:719: py:meth reference target not found: Loader.exec_module [ref.meth]
Doc/library/importlib.rst:733: py:meth reference target not found: Loader.create_module [ref.meth]
Doc/library/importlib.rst:733: py:meth reference target not found: Loader.exec_module [ref.meth]
Doc/library/importlib.rst:1179: py:func reference target not found: get_tag [ref.func]
Doc/library/importlib.rst:1179: py:attr reference target not found: sys.implementation.cache_tag [ref.attr]
Doc/library/importlib.rst:1211: py:attr reference target not found: sys.implementation.cache_tag [ref.attr]
Doc/library/importlib.rst:1266: py:func reference target not found: import_module [ref.func]
Doc/library/importlib.rst:1293: py:meth reference target not found: InspectLoader.is_package [ref.meth]

Doc/library/mmap.rst:11: py:meth reference target not found: seek [ref.meth]
Doc/library/mmap.rst:33: py:const reference target not found: ACCESS_READ [ref.const]
Doc/library/mmap.rst:33: py:const reference target not found: ACCESS_WRITE [ref.const]
Doc/library/mmap.rst:33: py:const reference target not found: ACCESS_COPY [ref.const]
Doc/library/mmap.rst:33: py:const reference target not found: ACCESS_DEFAULT [ref.const]
Doc/library/mmap.rst:47: py:const reference target not found: ACCESS_DEFAULT [ref.const]
Doc/library/mmap.rst:69: py:const reference target not found: ALLOCATIONGRANULARITY [ref.const]
Doc/library/mmap.rst:103: py:const reference target not found: PROT_READ [ref.const]
Doc/library/mmap.rst:103: py:const reference target not found: PROT_WRITE [ref.const]
Doc/library/mmap.rst:103: py:const reference target not found: PROT_READ | PROT_WRITE [ref.const]
Doc/library/mmap.rst:113: py:const reference target not found: ALLOCATIONGRANULARITY [ref.const]
Doc/library/mmap.rst:113: py:const reference target not found: PAGESIZE [ref.const]
Doc/library/mmap.rst:217: py:const reference target not found: PAGESIZE [ref.const]
Doc/library/mmap.rst:217: py:const reference target not found: ALLOCATIONGRANULARITY [ref.const]
Doc/library/mmap.rst:250: py:const reference target not found: PAGESIZE [ref.const]
Doc/library/mmap.rst:264: py:const reference target not found: ACCESS_READ [ref.const]
Doc/library/mmap.rst:297: py:const reference target not found: ACCESS_READ [ref.const]
Doc/library/mmap.rst:297: py:const reference target not found: ACCESS_COPY [ref.const]
Doc/library/mmap.rst:368: py:const reference target not found: ACCESS_READ [ref.const]
Doc/library/mmap.rst:384: py:const reference target not found: ACCESS_READ [ref.const]

Doc/library/multiprocessing.rst:302: py:meth reference target not found: Connection.send [ref.meth]
Doc/library/multiprocessing.rst:302: py:meth reference target not found: Connection.recv [ref.meth]
Doc/library/multiprocessing.rst:310: py:meth reference target not found: Connection.send [ref.meth]
Doc/library/multiprocessing.rst:310: py:meth reference target not found: Connection.recv [ref.meth]
Doc/library/multiprocessing.rst:812: py:meth reference target not found: Connection.recv_bytes_into [ref.meth]
Doc/library/multiprocessing.rst:919: py:meth reference target not found: multiprocessing.Connection.send [ref.meth]
Doc/library/multiprocessing.rst:919: py:meth reference target not found: multiprocessing.Connection.recv [ref.meth]
Doc/library/multiprocessing.rst:1245: py:class reference target not found: Pool [ref.class]
Doc/library/multiprocessing.rst:1377: py:exc reference target not found: BufferTooShort [ref.exc]
Doc/library/multiprocessing.rst:1418: py:func reference target not found: Pipe [ref.func]
Doc/library/multiprocessing.rst:1657: py:mod reference target not found: multiprocessing.synchronize [ref.mod]
Doc/library/multiprocessing.rst:1835: py:meth reference target not found: get_obj [ref.meth]
Doc/library/multiprocessing.rst:1835: py:meth reference target not found: get_lock [ref.meth]
Doc/library/multiprocessing.rst:1971: py:class reference target not found: Server [ref.class]
Doc/library/multiprocessing.rst:1971: py:meth reference target not found: serve_forever [ref.meth]
Doc/library/multiprocessing.rst:1980: py:class reference target not found: Server [ref.class]
Doc/library/multiprocessing.rst:2015: py:attr reference target not found: proxytype._exposed_ [ref.attr]
Doc/library/multiprocessing.rst:2024: py:attr reference target not found: proxytype._method_to_typeid_ [ref.attr]
Doc/library/multiprocessing.rst:2370: py:exc reference target not found: RemoteError [ref.exc]
Doc/library/multiprocessing.rst:2443: py:func reference target not found: multiprocessing.Pool [ref.func]
Doc/library/multiprocessing.rst:2443: py:func reference target not found: get_context [ref.func]
Doc/library/multiprocessing.rst:3173: py:meth reference target not found: multiprocessing.Process._bootstrap [ref.meth]

Doc/library/optparse.rst:564: py:meth reference target not found: set_defaults [ref.meth]
Doc/library/optparse.rst:603: py:meth reference target not found: parser.print_help [ref.meth]
Doc/library/optparse.rst:685: py:class reference target not found: OptionContainer [ref.class]
Doc/library/optparse.rst:685: py:meth reference target not found: add_option [ref.meth]
Doc/library/optparse.rst:689: py:meth reference target not found: add_option_group [ref.meth]
Doc/library/optparse.rst:825: py:func reference target not found: OptionParser.error [ref.func]
Doc/library/optparse.rst:861: py:func reference target not found: OptionParser.error [ref.func]
Doc/library/optparse.rst:865: py:meth reference target not found: OptionParser.exit [ref.meth]
Doc/library/optparse.rst:865: py:meth reference target not found: OptionParser.error [ref.meth]
Doc/library/optparse.rst:920: py:const reference target not found: optparse.SUPPRESS_USAGE [ref.const]
Doc/library/optparse.rst:953: py:class reference target not found: IndentedHelpFormatter [ref.class]
Doc/library/optparse.rst:974: py:meth reference target not found: add_option [ref.meth]
Doc/library/optparse.rst:978: py:func reference target not found: make_option [ref.func]
Doc/library/optparse.rst:980: py:func reference target not found: make_option [ref.func]
Doc/library/optparse.rst:995: py:func reference target not found: make_option [ref.func]
Doc/library/optparse.rst:1010: py:meth reference target not found: add_option [ref.meth]
Doc/library/optparse.rst:1187: py:const reference target not found: optparse.SUPPRESS_HELP [ref.const]
Doc/library/optparse.rst:1360: py:const reference target not found: optparse.SUPPRESS_HELP [ref.const]
Doc/library/optparse.rst:1438: py:func reference target not found: optparse.check_choice [ref.func]
Doc/library/optparse.rst:1481: py:meth reference target not found: error [ref.meth]
Doc/library/optparse.rst:1614: py:meth reference target not found: OptionParser.destroy [ref.meth]
Doc/library/optparse.rst:1631: py:const reference target not found: optparse.SUPPRESS_USAGE [ref.const]
Doc/library/optparse.rst:2007: py:meth reference target not found: error [ref.meth]
Doc/library/optparse.rst:2052: py:meth reference target not found: add_option [ref.meth]
Doc/library/optparse.rst:2105: py:meth reference target not found: take_action [ref.meth]
Doc/library/optparse.rst:2148: py:meth reference target not found: MyOption.take_action [ref.meth]
Doc/library/optparse.rst:2148: py:meth reference target not found: Option.take_action [ref.meth]
Doc/library/optparse.rst:2152: py:meth reference target not found: ensure_value [ref.meth]
Doc/library/optparse.rst:2158: py:meth reference target not found: ensure_value [ref.meth]

Doc/library/pickletools.rst:109: py:class reference target not found: OpcodeInfo [ref.class]

Doc/library/socket.rst:24: py:meth reference target not found: read [ref.meth]
Doc/library/socket.rst:24: py:meth reference target not found: write [ref.meth]
Doc/library/socket.rst:78: py:const reference target not found: INADDR_ANY [ref.const]
Doc/library/socket.rst:78: py:const reference target not found: INADDR_BROADCAST [ref.const]
Doc/library/socket.rst:85: py:const reference target not found: struct sockaddr_in6 [ref.const]
Doc/library/socket.rst:97: py:const reference target not found: AF_NETLINK [ref.const]
Doc/library/socket.rst:99: py:const reference target not found: AF_TIPC [ref.const]
Doc/library/socket.rst:105: py:const reference target not found: TIPC_ADDR_NAMESEQ [ref.const]
Doc/library/socket.rst:105: py:const reference target not found: TIPC_ADDR_NAME [ref.const]
Doc/library/socket.rst:105: py:const reference target not found: TIPC_ADDR_ID [ref.const]
Doc/library/socket.rst:107: py:const reference target not found: TIPC_ZONE_SCOPE [ref.const]
Doc/library/socket.rst:107: py:const reference target not found: TIPC_CLUSTER_SCOPE [ref.const]
Doc/library/socket.rst:107: py:const reference target not found: TIPC_NODE_SCOPE [ref.const]
Doc/library/socket.rst:109: py:const reference target not found: TIPC_ADDR_NAME [ref.const]
Doc/library/socket.rst:112: py:const reference target not found: TIPC_ADDR_NAMESEQ [ref.const]
Doc/library/socket.rst:115: py:const reference target not found: TIPC_ADDR_ID [ref.const]
Doc/library/socket.rst:131: py:const reference target not found: SYSPROTO_CONTROL [ref.const]
Doc/library/socket.rst:131: py:const reference target not found: PF_SYSTEM [ref.const]
Doc/library/socket.rst:247: py:const reference target not found: IPPROTO_UDPLITE [ref.const]
Doc/library/socket.rst:323: c:func reference target not found: hstrerror [ref.func]
Doc/library/socket.rst:336: c:func reference target not found: gai_strerror [ref.func]
Doc/library/socket.rst:367: py:class reference target not found: AddressFamily [ref.class]
Doc/library/socket.rst:367: py:class reference target not found: SocketKind [ref.class]
Doc/library/socket.rst:520: py:data reference target not found: CAN_BCM_CAN_FD_FRAME [ref.data]
Doc/library/socket.rst:779: py:data reference target not found: SO_REUSEPORT [ref.data]
Doc/library/socket.rst:904: py:data reference target not found: SO_REUSEPORT [ref.data]
Doc/library/socket.rst:931: py:data reference target not found: SO_REUSEADDR [ref.data]
Doc/library/socket.rst:1001: py:const reference target not found: AI_NUMERICHOST [ref.const]
Doc/library/socket.rst:1010: py:const reference target not found: AI_CANONNAME [ref.const]
Doc/library/socket.rst:1028: py:data reference target not found: IPPROTO_TCP [ref.data]
Doc/library/socket.rst:1028: py:data reference target not found: IPPROTO_UDP [ref.data]
Doc/library/socket.rst:1449: py:const reference target not found: SCM_RIGHTS [ref.const]
Doc/library/socket.rst:1463: py:const reference target not found: SCM_RIGHTS [ref.const]
Doc/library/socket.rst:1480: py:const reference target not found: CAN_RAW [ref.const]
Doc/library/socket.rst:2386: py:const reference target not found: CAN_RAW [ref.const]
Doc/library/socket.rst:2438: py:const reference target not found: socket.SO_REUSEADDR [ref.const]
Doc/library/socket.rst:2445: py:data reference target not found: SO_REUSEADDR [ref.data]

Doc/library/ssl.rst:40: py:meth reference target not found: getpeercert [ref.meth]
Doc/library/ssl.rst:40: py:meth reference target not found: cipher [ref.meth]
Doc/library/ssl.rst:40: py:meth reference target not found: get_verified_chain [ref.meth]
Doc/library/ssl.rst:40: py:meth reference target not found: get_unverified_chain [ref.meth]
Doc/library/ssl.rst:203: 'envvar' reference target not found: SSLKEYLOGFILE [ref.envvar]
Doc/library/ssl.rst:443: py:attr reference target not found: cafile [ref.attr]
Doc/library/ssl.rst:444: py:attr reference target not found: capath [ref.attr]
Doc/library/ssl.rst:445: py:attr reference target not found: openssl_cafile_env [ref.attr]
Doc/library/ssl.rst:446: py:attr reference target not found: openssl_cafile [ref.attr]
Doc/library/ssl.rst:447: py:attr reference target not found: openssl_capath_env [ref.attr]
Doc/library/ssl.rst:448: py:attr reference target not found: openssl_capath [ref.attr]
Doc/library/ssl.rst:458: py:const reference target not found: x509_asn [ref.const]
Doc/library/ssl.rst:458: py:const reference target not found: pkcs_7_asn [ref.const]
Doc/library/ssl.rst:481: py:const reference target not found: x509_asn [ref.const]
Doc/library/ssl.rst:481: py:const reference target not found: pkcs_7_asn [ref.const]
Doc/library/ssl.rst:1112: py:meth reference target not found: sendfile [ref.meth]
Doc/library/ssl.rst:1115: py:meth reference target not found: shutdown [ref.meth]
Doc/library/ssl.rst:1159: py:meth reference target not found: SSLSocket.recv [ref.meth]
Doc/library/ssl.rst:1177: py:meth reference target not found: SSLSocket.send [ref.meth]
Doc/library/ssl.rst:1933: py:meth reference target not found: connect [ref.meth]
Doc/library/ssl.rst:1933: py:meth reference target not found: accept [ref.meth]
Doc/library/ssl.rst:1947: py:meth reference target not found: socket.connect [ref.meth]
Doc/library/ssl.rst:1954: py:meth reference target not found: SSLSocket.recv [ref.meth]
Doc/library/ssl.rst:2544: py:meth reference target not found: listen [ref.meth]
Doc/library/ssl.rst:2559: py:meth reference target not found: accept [ref.meth]
Doc/library/ssl.rst:2616: py:meth reference target not found: SSLSocket.recv [ref.meth]
Doc/library/ssl.rst:2616: py:meth reference target not found: SSLSocket.send [ref.meth]
Doc/library/ssl.rst:2623: py:meth reference target not found: SSLSocket.recv [ref.meth]

Doc/library/termios.rst:34: py:const reference target not found: VMIN [ref.const]
Doc/library/termios.rst:34: py:const reference target not found: VTIME [ref.const]
Doc/library/termios.rst:76: py:const reference target not found: TCIFLUSH [ref.const]
Doc/library/termios.rst:76: py:const reference target not found: TCOFLUSH [ref.const]
Doc/library/termios.rst:76: py:const reference target not found: TCIOFLUSH [ref.const]
Doc/library/termios.rst:83: py:const reference target not found: TCOOFF [ref.const]
Doc/library/termios.rst:83: py:const reference target not found: TCOON [ref.const]
Doc/library/termios.rst:83: py:const reference target not found: TCIOFF [ref.const]
Doc/library/termios.rst:83: py:const reference target not found: TCION [ref.const]
Doc/library/termios.rst:90: py:const reference target not found: termios.TIOCGWINSZ [ref.const]
Doc/library/termios.rst:90: py:const reference target not found: termios.TIOCGSIZE [ref.const]
Doc/library/termios.rst:99: py:const reference target not found: termios.TIOCGWINSZ [ref.const]
Doc/library/termios.rst:99: py:const reference target not found: termios.TIOCSWINSZ [ref.const]
Doc/library/termios.rst:99: py:const reference target not found: termios.TIOCGSIZE [ref.const]
Doc/library/termios.rst:99: py:const reference target not found: termios.TIOCSSIZE [ref.const]

Doc/library/test.rst:163: py:func reference target not found: test_main [ref.func]
Doc/library/test.rst:396: c:macro reference target not found: WITH_DOC_STRINGS [ref.macro]
Doc/library/test.rst:506: py:const reference target not found: _testcapi.WITH_PYMALLOC [ref.const]
Doc/library/test.rst:1020: py:mod reference target not found: multiprocessing.synchronize [ref.mod]
Doc/library/test.rst:1132: py:const reference target not found: socket.SO_REUSEADDR [ref.const]
Doc/library/test.rst:1132: py:const reference target not found: socket.SO_REUSEPORT [ref.const]
Doc/library/test.rst:1143: py:const reference target not found: socket.SO_EXCLUSIVEADDRUSE [ref.const]
Doc/library/test.rst:1191: 'envvar' reference target not found: PYTHONUSERSITE [ref.envvar]
Doc/library/test.rst:1612: py:func reference target not found: reload [ref.func]
Doc/library/test.rst:1777: py:class reference target not found: WarningRecorder [ref.class]
Doc/library/test.rst:1786: py:meth reference target not found: reset [ref.meth]

Doc/library/wsgiref.rst:161: py:meth reference target not found: read [ref.meth]
Doc/library/wsgiref.rst:169: py:meth reference target not found: close [ref.meth]
Doc/library/wsgiref.rst:221: py:meth reference target not found: keys [ref.meth]
Doc/library/wsgiref.rst:221: py:meth reference target not found: values [ref.meth]
Doc/library/wsgiref.rst:221: py:meth reference target not found: items [ref.meth]
Doc/library/wsgiref.rst:280: py:func reference target not found: shift_path_info [ref.func]
Doc/library/wsgiref.rst:331: py:meth reference target not found: serve_forever [ref.meth]
Doc/library/wsgiref.rst:331: py:meth reference target not found: handle_request [ref.meth]
Doc/library/wsgiref.rst:365: py:attr reference target not found: base_environ [ref.attr]
Doc/library/wsgiref.rst:406: py:mod reference target not found: paste.lint [ref.mod]
Doc/library/wsgiref.rst:528: py:attr reference target not found: stdin [ref.attr]
Doc/library/wsgiref.rst:528: py:attr reference target not found: stdout [ref.attr]
Doc/library/wsgiref.rst:528: py:attr reference target not found: stderr [ref.attr]
Doc/library/wsgiref.rst:528: py:attr reference target not found: environ [ref.attr]
Doc/library/wsgiref.rst:591: py:attr reference target not found: environ [ref.attr]
Doc/library/wsgiref.rst:647: py:func reference target not found: guess_scheme [ref.func]
Doc/library/wsgiref.rst:647: py:attr reference target not found: environ [ref.attr]
Doc/library/wsgiref.rst:655: py:attr reference target not found: environ [ref.attr]