0.3.0: sphinxcontrib-asyncio does not work on Sphinx 6

I funt that on building `aiohttp` documetation sphinf fails with call trace

```console
+ /usr/bin/sphinx-build -n -T -b man docs build/sphinx/man
Running Sphinx v6.1.3
making output directory... done
loading intersphinx inventory from http://docs.pytest.org/en/latest/objects.inv...
loading intersphinx inventory from http://docs.python.org/3/objects.inv...
loading intersphinx inventory from https://multidict.readthedocs.io/en/stable/objects.inv...
loading intersphinx inventory from https://yarl.readthedocs.io/en/stable/objects.inv...
loading intersphinx inventory from https://aiosignal.readthedocs.io/en/stable/objects.inv...
loading intersphinx inventory from https://aiohttp-jinja2.readthedocs.io/en/stable/objects.inv...
loading intersphinx inventory from https://aiohttp-remotes.readthedocs.io/en/stable/objects.inv...
loading intersphinx inventory from https://aiohttp-session.readthedocs.io/en/stable/objects.inv...
loading intersphinx inventory from https://aiohttp-demos.readthedocs.io/en/latest/objects.inv...
intersphinx inventory has moved: http://docs.python.org/3/objects.inv -> https://docs.python.org/3/objects.inv
intersphinx inventory has moved: http://docs.pytest.org/en/latest/objects.inv -> https://docs.pytest.org/en/latest/objects.inv
intersphinx inventory has moved: https://multidict.readthedocs.io/en/stable/objects.inv -> https://multidict.aio-libs.org/en/stable/objects.inv
intersphinx inventory has moved: https://yarl.readthedocs.io/en/stable/objects.inv -> https://yarl.aio-libs.org/en/stable/objects.inv
intersphinx inventory has moved: https://aiosignal.readthedocs.io/en/stable/objects.inv -> https://aiosignal.aio-libs.org/en/stable/objects.inv
building [mo]: targets for 0 po files that are out of date
writing output...
building [man]: all manpages
updating environment: [new config] 37 added, 0 changed, 0 removed
reading sources... [ 5%] abc
Traceback (most recent call last):
File "/usr/lib/python3.8/site-packages/sphinx/cmd/build.py", line 284, in build_main
app.build(args.force_all, args.filenames)
File "/usr/lib/python3.8/site-packages/sphinx/application.py", line 347, in build
self.builder.build_update()
File "/usr/lib/python3.8/site-packages/sphinx/builders/__init__.py", line 308, in build_update
self.build(['__all__'], to_build)
File "/usr/lib/python3.8/site-packages/sphinx/builders/__init__.py", line 327, in build
updated_docnames = set(self.read())
File "/usr/lib/python3.8/site-packages/sphinx/builders/__init__.py", line 434, in read
self._read_serial(docnames)
File "/usr/lib/python3.8/site-packages/sphinx/builders/__init__.py", line 455, in _read_serial
self.read_doc(docname)
File "/usr/lib/python3.8/site-packages/sphinx/builders/__init__.py", line 511, in read_doc
publisher.publish()
File "/usr/lib/python3.8/site-packages/docutils/core.py", line 224, in publish
self.document = self.reader.read(self.source, self.parser,
File "/usr/lib/python3.8/site-packages/sphinx/io.py", line 105, in read
self.parse()
File "/usr/lib/python3.8/site-packages/docutils/readers/__init__.py", line 76, in parse
self.parser.parse(self.input, document)
File "/usr/lib/python3.8/site-packages/sphinx/parsers.py", line 80, in parse
self.statemachine.run(inputlines, document, inliner=self.inliner)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 169, in run
results = StateMachineWS.run(self, input_lines, input_offset,
File "/usr/lib/python3.8/site-packages/docutils/statemachine.py", line 233, in run
context, next_state, result = self.check_line(
File "/usr/lib/python3.8/site-packages/docutils/statemachine.py", line 445, in check_line
return method(match, context, next_state)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 2785, in underline
self.section(title, source, style, lineno - 1, messages)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 325, in section
self.new_subsection(title, lineno, messages)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 391, in new_subsection
newabsoffset = self.nested_parse(
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 279, in nested_parse
state_machine.run(block, input_offset, memo=self.memo,
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 195, in run
results = StateMachineWS.run(self, input_lines, input_offset)
File "/usr/lib/python3.8/site-packages/docutils/statemachine.py", line 233, in run
context, next_state, result = self.check_line(
File "/usr/lib/python3.8/site-packages/docutils/statemachine.py", line 445, in check_line
return method(match, context, next_state)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 2785, in underline
self.section(title, source, style, lineno - 1, messages)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 325, in section
self.new_subsection(title, lineno, messages)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 391, in new_subsection
newabsoffset = self.nested_parse(
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 279, in nested_parse
state_machine.run(block, input_offset, memo=self.memo,
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 195, in run
results = StateMachineWS.run(self, input_lines, input_offset)
File "/usr/lib/python3.8/site-packages/docutils/statemachine.py", line 233, in run
context, next_state, result = self.check_line(
File "/usr/lib/python3.8/site-packages/docutils/statemachine.py", line 445, in check_line
return method(match, context, next_state)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 2355, in explicit_markup
nodelist, blank_finish = self.explicit_construct(match)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 2367, in explicit_construct
return method(self, expmatch)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 2104, in directive
return self.run_directive(
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 2154, in run_directive
result = directive_instance.run()
File "/usr/lib/python3.8/site-packages/sphinx/domains/__init__.py", line 286, in run
return super().run()
File "/usr/lib/python3.8/site-packages/sphinx/directives/__init__.py", line 265, in run
nested_parse_with_titles(self.state, self.content, contentnode)
File "/usr/lib/python3.8/site-packages/sphinx/util/nodes.py", line 327, in nested_parse_with_titles
return state.nested_parse(content, 0, node, match_titles=1)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 279, in nested_parse
state_machine.run(block, input_offset, memo=self.memo,
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 195, in run
results = StateMachineWS.run(self, input_lines, input_offset)
File "/usr/lib/python3.8/site-packages/docutils/statemachine.py", line 233, in run
context, next_state, result = self.check_line(
File "/usr/lib/python3.8/site-packages/docutils/statemachine.py", line 445, in check_line
return method(match, context, next_state)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 2355, in explicit_markup
nodelist, blank_finish = self.explicit_construct(match)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 2367, in explicit_construct
return method(self, expmatch)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 2104, in directive
return self.run_directive(
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 2154, in run_directive
result = directive_instance.run()
File "/usr/lib/python3.8/site-packages/sphinx/domains/__init__.py", line 286, in run
return super().run()
File "/usr/lib/python3.8/site-packages/sphinxcontrib/asyncio.py", line 65, in run
return super(PyCoroutineMethod, self).run()
File "/usr/lib/python3.8/site-packages/sphinx/directives/__init__.py", line 236, in run
name = self.handle_signature(sig, signode)
File "/usr/lib/python3.8/site-packages/sphinx/domains/python.py", line 540, in handle_signature
raise TypeError(
TypeError: Python directive method get_signature_prefix() must return a list of nodes. Return value was 'coroutine '.

Exception occurred:
File "/usr/lib/python3.8/site-packages/sphinx/domains/python.py", line 540, in handle_signature
raise TypeError(
TypeError: Python directive method get_signature_prefix() must return a list of nodes. Return value was 'coroutine '.
The full traceback has been saved in /tmp/sphinx-err-00_3cgqr.log, if you want to report the issue to the developers.
Please also report this if it was a user error, so that a better error message can be provided next time.
A bug report can be filed in the tracker at . Thanks!

# Traceback:
Traceback (most recent call last):
File "/usr/lib/python3.8/site-packages/sphinx/cmd/build.py", line 284, in build_main
app.build(args.force_all, args.filenames)
File "/usr/lib/python3.8/site-packages/sphinx/application.py", line 347, in build
self.builder.build_update()
File "/usr/lib/python3.8/site-packages/sphinx/builders/__init__.py", line 308, in build_update
self.build(['__all__'], to_build)
File "/usr/lib/python3.8/site-packages/sphinx/builders/__init__.py", line 327, in build
updated_docnames = set(self.read())
File "/usr/lib/python3.8/site-packages/sphinx/builders/__init__.py", line 434, in read
self._read_serial(docnames)
File "/usr/lib/python3.8/site-packages/sphinx/builders/__init__.py", line 455, in _read_serial
self.read_doc(docname)
File "/usr/lib/python3.8/site-packages/sphinx/builders/__init__.py", line 511, in read_doc
publisher.publish()
File "/usr/lib/python3.8/site-packages/docutils/core.py", line 224, in publish
self.document = self.reader.read(self.source, self.parser,
File "/usr/lib/python3.8/site-packages/sphinx/io.py", line 105, in read
self.parse()
File "/usr/lib/python3.8/site-packages/docutils/readers/__init__.py", line 76, in parse
self.parser.parse(self.input, document)
File "/usr/lib/python3.8/site-packages/sphinx/parsers.py", line 80, in parse
self.statemachine.run(inputlines, document, inliner=self.inliner)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 169, in run
results = StateMachineWS.run(self, input_lines, input_offset,
File "/usr/lib/python3.8/site-packages/docutils/statemachine.py", line 233, in run
context, next_state, result = self.check_line(
File "/usr/lib/python3.8/site-packages/docutils/statemachine.py", line 445, in check_line
return method(match, context, next_state)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 2785, in underline
self.section(title, source, style, lineno - 1, messages)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 325, in section
self.new_subsection(title, lineno, messages)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 391, in new_subsection
newabsoffset = self.nested_parse(
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 279, in nested_parse
state_machine.run(block, input_offset, memo=self.memo,
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 195, in run
results = StateMachineWS.run(self, input_lines, input_offset)
File "/usr/lib/python3.8/site-packages/docutils/statemachine.py", line 233, in run
context, next_state, result = self.check_line(
File "/usr/lib/python3.8/site-packages/docutils/statemachine.py", line 445, in check_line
return method(match, context, next_state)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 2785, in underline
self.section(title, source, style, lineno - 1, messages)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 325, in section
self.new_subsection(title, lineno, messages)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 391, in new_subsection
newabsoffset = self.nested_parse(
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 279, in nested_parse
state_machine.run(block, input_offset, memo=self.memo,
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 195, in run
results = StateMachineWS.run(self, input_lines, input_offset)
File "/usr/lib/python3.8/site-packages/docutils/statemachine.py", line 233, in run
context, next_state, result = self.check_line(
File "/usr/lib/python3.8/site-packages/docutils/statemachine.py", line 445, in check_line
return method(match, context, next_state)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 2355, in explicit_markup
nodelist, blank_finish = self.explicit_construct(match)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 2367, in explicit_construct
return method(self, expmatch)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 2104, in directive
return self.run_directive(
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 2154, in run_directive
result = directive_instance.run()
File "/usr/lib/python3.8/site-packages/sphinx/domains/__init__.py", line 286, in run
return super().run()
File "/usr/lib/python3.8/site-packages/sphinx/directives/__init__.py", line 265, in run
nested_parse_with_titles(self.state, self.content, contentnode)
File "/usr/lib/python3.8/site-packages/sphinx/util/nodes.py", line 327, in nested_parse_with_titles
return state.nested_parse(content, 0, node, match_titles=1)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 279, in nested_parse
state_machine.run(block, input_offset, memo=self.memo,
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 195, in run
results = StateMachineWS.run(self, input_lines, input_offset)
File "/usr/lib/python3.8/site-packages/docutils/statemachine.py", line 233, in run
context, next_state, result = self.check_line(
File "/usr/lib/python3.8/site-packages/docutils/statemachine.py", line 445, in check_line
return method(match, context, next_state)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 2355, in explicit_markup
nodelist, blank_finish = self.explicit_construct(match)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 2367, in explicit_construct
return method(self, expmatch)
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 2104, in directive
return self.run_directive(
File "/usr/lib/python3.8/site-packages/docutils/parsers/rst/states.py", line 2154, in run_directive
result = directive_instance.run()
File "/usr/lib/python3.8/site-packages/sphinx/domains/__init__.py", line 286, in run
return super().run()
File "/usr/lib/python3.8/site-packages/sphinxcontrib/asyncio.py", line 65, in run
return super(PyCoroutineMethod, self).run()
File "/usr/lib/python3.8/site-packages/sphinx/directives/__init__.py", line 236, in run
name = self.handle_signature(sig, signode)
File "/usr/lib/python3.8/site-packages/sphinx/domains/python.py", line 540, in handle_signature
raise TypeError(
TypeError: Python directive method get_signature_prefix() must return a list of nodes. Return value was 'coroutine '.
```

Here is list of installed modules in build env

```console
Package Version
----------------------------- -----------------
aiosignal 1.3.1
alabaster 0.7.13
appdirs 1.4.4
async-generator 1.10
async-timeout 4.0.2
attrs 22.2.0
Babel 2.11.0
Brotli 1.0.9
build 0.9.0
charset-normalizer 3.0.1
coverage 7.1.0
cssselect 1.1.0
Cython 0.29.33
distro 1.8.0
docutils 0.19
exceptiongroup 1.0.0
extras 1.0.0
fixtures 4.0.0
freezegun 1.2.1
frozenlist 1.3.3
gpg 1.18.0-unknown
idna 3.4
imagesize 1.4.1
importlib-metadata 6.0.0
iniconfig 2.0.0
Jinja2 3.1.2
libcomps 0.1.19
lxml 4.9.2
Markdown 3.4.1
MarkupSafe 2.1.2
multidict 6.0.4
numpy 1.24.2
olefile 0.46
packaging 23.0
pbr 5.9.0
pep517 0.13.0
Pillow 9.4.0
pip 22.3.1
pluggy 1.0.0
Pygments 2.14.0
PyGObject 3.43.1.dev0
pytest 7.2.1
pytest-cov 4.0.0
pytest-mock 3.10.0
python-dateutil 2.8.2
pytz 2022.4
re-assert 1.1.0
regex 2022.10.31
requests 2.28.2
rpm 4.17.0
scour 0.38.2
setuptools 65.6.3
six 1.16.0
smartypants 2.0.1
snowballstemmer 2.2.0
Sphinx 6.1.3
sphinxcontrib-applehelp 1.0.2.dev20221204
sphinxcontrib-asyncio 0.3.0
sphinxcontrib-devhelp 1.0.2.dev20230202
sphinxcontrib-htmlhelp 2.0.0
sphinxcontrib-jsmath 1.0.1.dev20230128
sphinxcontrib-qthelp 1.0.3.dev20230128
sphinxcontrib-serializinghtml 1.1.5
testtools 2.5.0
toml 0.10.2
tomli 2.0.1
typing_extensions 4.4.0
typogrify 2.0.7
urllib3 1.26.12
wheel 0.38.4
yarl 1.8.2
zipp 3.13.0
```