Add docstrings for typing.SupportsXXX classes

[serhiy-storchaka]

BPO	38407
Nosy	@gvanrossum, @serhiy-storchaka, @ilevkivskyi, @miss-islington
PRs	bpo-38407: Add docstrings for typing.SupportsXXX classes. #16644 [3.8] bpo-38407: Add docstrings for typing.SupportsXXX classes. (GH-16644) #16656 [3.7] bpo-38407: Add docstrings for typing.SupportsXXX classes. (GH-16644). #16673

^{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 2019-10-09.09:58:31.268>
created_at = <Date 2019-10-08.08:59:44.057>
labels = ['3.8', '3.7', 'library', '3.9']
title = 'Add docstrings for typing.SupportsXXX classes'
updated_at = <Date 2019-10-09.09:58:31.268>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2019-10-09.09:58:31.268>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2019-10-09.09:58:31.268>
closer = 'serhiy.storchaka'
components = ['Library (Lib)']
creation = <Date 2019-10-08.08:59:44.057>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 38407
keywords = ['patch']
message_count = 4.0
messages = ['354179', '354204', '354212', '354261']
nosy_count = 4.0
nosy_names = ['gvanrossum', 'serhiy.storchaka', 'levkivskyi', 'miss-islington']
pr_nums = ['16644', '16656', '16673']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue38407'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']

[serhiy-storchaka]

typing.SupportsXXX classes do not have docstrings and help() shows the docstring of the parent class instead, which is wrong ("Base class for protocol classes...").

[serhiy-storchaka]

New changeset 8252c52 by Serhiy Storchaka in branch 'master':
bpo-38407: Add docstrings for typing.SupportsXXX classes. (GH-16644)
8252c52

[miss-islington]

New changeset 7162440 by Miss Islington (bot) in branch '3.8':
bpo-38407: Add docstrings for typing.SupportsXXX classes. (GH-16644)
7162440

[serhiy-storchaka]

New changeset 0b354fc by Serhiy Storchaka in branch '3.7':
[3.7] bpo-38407: Add docstrings for typing.SupportsXXX classes. (GH-16644). (GH-16673)
0b354fc