Missing documentation for typing.AsyncContextManager

[travigd]

BPO	33421
Nosy	@ezio-melotti, @merwok, @willingc, @ilevkivskyi, @travigd
PRs	bpo-33421: Add AsyncContextManager to typing module documentation. #6700 bpo-33421: Add AsyncContextManager to typing module documentation (Python 3.7+). #6822 bpo-33421: Add AsyncContextManager to typing module documentation (Python 3.6). #6823 [3.7] bpo-33421: Add AsyncContextManager to typing module documentation. (GH-6822) #6839

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2018-05-23.15:15:27.714>
created_at = <Date 2018-05-03.23:33:14.795>
labels = ['3.8', 'type-feature', '3.7', 'docs']
title = 'Missing documentation for typing.AsyncContextManager'
updated_at = <Date 2018-05-23.15:15:27.712>
user = 'https://github.com/travigd'

bugs.python.org fields:

activity = <Date 2018-05-23.15:15:27.712>
actor = 'levkivskyi'
assignee = 'docs@python'
closed = True
closed_date = <Date 2018-05-23.15:15:27.714>
closer = 'levkivskyi'
components = ['Documentation']
creation = <Date 2018-05-03.23:33:14.795>
creator = 'Travis DePrato'
dependencies = []
files = []
hgrepos = []
issue_num = 33421
keywords = ['patch']
message_count = 2.0
messages = ['316145', '317416']
nosy_count = 6.0
nosy_names = ['ezio.melotti', 'eric.araujo', 'docs@python', 'willingc', 'levkivskyi', 'Travis DePrato']
pr_nums = ['6700', '6822', '6823', '6839']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue33421'
versions = ['Python 3.5', 'Python 3.6', 'Python 3.7', 'Python 3.8']

[travigd]

The documentation for the typing module makes no mention of AsyncContextManager, which is defined in Lib/typing.py as

    AsyncContextManager = _alias(contextlib.AbstractAsyncContextManager, T_co)

as of >= Python 3.8; before 3.8, no such AbstractAsyncContextManager class exists.

[ilevkivskyi]

This is now fixed.