Reference to depricated collections.abc class in collections is unnecessary and confusing

[khalidmammadov]

BPO	39139
Nosy	@rhettinger, @tirkarthi, @khalidmammadov
PRs	bpo-39139: To be clear what depreciation relates to i.e Collections ABS #17707

^{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 2020-02-22.19:46:58.885>
created_at = <Date 2019-12-26.16:44:22.622>
labels = ['type-feature', '3.8', 'docs']
title = 'Reference to depricated collections.abc class in collections is unnecessary and confusing'
updated_at = <Date 2020-02-22.19:47:16.219>
user = 'https://github.com/khalidmammadov'

bugs.python.org fields:

activity = <Date 2020-02-22.19:47:16.219>
actor = 'khalidmammadov'
assignee = 'docs@python'
closed = True
closed_date = <Date 2020-02-22.19:46:58.885>
closer = 'khalidmammadov'
components = ['Documentation']
creation = <Date 2019-12-26.16:44:22.622>
creator = 'khalidmammadov'
dependencies = []
files = []
hgrepos = []
issue_num = 39139
keywords = ['patch']
message_count = 4.0
messages = ['358889', '358890', '362254', '362475']
nosy_count = 4.0
nosy_names = ['rhettinger', 'docs@python', 'xtreak', 'khalidmammadov']
pr_nums = ['17707']
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue39139'
versions = ['Python 3.8']

[khalidmammadov]

"Deprecated since version 3.3, will be removed in version 3.9: Moved Collections Abstract Base Classes to the collections.abc module. For backwards compatibility, they continue to be visible in this module through Python 3.8." on the overview is confusing as it's not listed on that page and explained on the next one.

[tirkarthi]

It can be updated since bpo-25988 removed the deprecation in Python 3.9.

[tirkarthi]

The removal in 3.9 was reverted and postponed to 3.10 in bpo-39674.

[khalidmammadov]

Looks like this is covered in greater detail in the other PRs. So, closing the PR and the issue