mmap: constants not listed in the documentation

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-10-19.19:32:50.645>
labels = ['3.11', 'type-feature', '3.9', '3.10', 'docs']
title = 'mmap: constants not listed in the documentation'
updated_at = <Date 2021-10-22.07:54:45.502>
user = 'https://github.com/goodmami'

bugs.python.org fields:

activity = <Date 2021-10-22.07:54:45.502>
actor = 'christian.heimes'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2021-10-19.19:32:50.645>
creator = 'goodmami'
dependencies = []
files = []
hgrepos = []
issue_num = 45528
keywords = ['patch']
message_count = 3.0
messages = ['404342', '404357', '404701']
nosy_count = 2.0
nosy_names = ['docs@python', 'goodmami']
pr_nums = ['29075']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue45528'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']