asyncio.StreadReader `async for line in reader` is not documented

[socketpair]

BPO	40567
Nosy	@asvetlov, @socketpair, @1st1

^{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 = None
created_at = <Date 2020-05-08.18:51:03.374>
labels = ['3.8', 'docs', '3.7', '3.9', 'expert-asyncio']
title = 'asyncio.StreadReader     `async for line in reader` is not documented'
updated_at = <Date 2020-05-08.18:51:13.351>
user = 'https://github.com/socketpair'

bugs.python.org fields:

activity = <Date 2020-05-08.18:51:13.351>
actor = 'socketpair'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation', 'asyncio']
creation = <Date 2020-05-08.18:51:03.374>
creator = 'socketpair'
dependencies = []
files = []
hgrepos = []
issue_num = 40567
keywords = []
message_count = 1.0
messages = ['368453']
nosy_count = 4.0
nosy_names = ['asvetlov', 'docs@python', 'socketpair', 'yselivanov']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue40567'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']

[socketpair]

Actually it works. But it is not documented. Please ad docs.

[slateny]

@socketpair Could you expand a bit on what works and what needs documenting? Is it that you're looking to get a link to the async for syntax, like say here and here?