Unclear meaning of _Private__names in enum docs.

[gpshead]

BPO	44174
Nosy	@gpshead, @ethanfurman, @Fidget-Spinner, @joeriddles
PRs	bpo-44174: [Enum] add reference to name mangling #29116 [3.10] bpo-44174: [Enum] add reference to name mangling #29117 [3.9] bpo-44174: [Enum] add name-mangling reference #29128

^{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 2021-10-21.18:33:16.931>
created_at = <Date 2021-05-19.03:27:49.970>
labels = ['easy', '3.11', '3.9', '3.10', 'docs']
title = 'Unclear meaning of _Private__names in enum docs.'
updated_at = <Date 2021-10-21.18:33:16.931>
user = 'https://github.com/gpshead'

bugs.python.org fields:

activity = <Date 2021-10-21.18:33:16.931>
actor = 'ethan.furman'
assignee = 'docs@python'
closed = True
closed_date = <Date 2021-10-21.18:33:16.931>
closer = 'ethan.furman'
components = ['Documentation']
creation = <Date 2021-05-19.03:27:49.970>
creator = 'gregory.p.smith'
dependencies = []
files = []
hgrepos = []
issue_num = 44174
keywords = ['patch', 'easy', 'newcomer friendly']
message_count = 8.0
messages = ['393919', '393939', '393960', '404517', '404524', '404565', '404618', '404633']
nosy_count = 5.0
nosy_names = ['gregory.p.smith', 'docs@python', 'ethan.furman', 'kj', 'joeriddles']
pr_nums = ['29116', '29117', '29128']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue44174'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

[gpshead]

https://docs.python.org/3/library/enum.html#private-names

"""
_Private__names

Private names will be normal attributes in Python 3.10 instead of either an error or a member (depending on if the name ends with an underscore). Using these names in 3.9 will issue a DeprecationWarning.
"""

It isn't clear from this documentation what is meant by "private names". Please expand on this to be explicit about what name pattern is being described.

[Fidget-Spinner]

I think linking to this part of the docs may help https://docs.python.org/3/reference/expressions.html#atom-identifiers

There's also already a label to reference to, so
the sentence could start with :ref:`Private names <private-name-mangling>`.