Deprecate camelCase aliases from threading.py

BPO	43723
Nosy	@rhettinger, @terryjreedy, @pitrou, @vstinner, @tiran, @JelleZijlstra, @miss-islington, @tirkarthi
PRs	bpo-43723: deprecate camelCase aliases from threading #25174 bpo-43723: Fix deprecation error caused by thread.setDaemon() (GH-25361) #25361 [3.9] bpo-43723: Backport IDLE doc change (GH-25174) #25432 [3.8] [3.9] bpo-43723: Revert IDLE doc change (GH-25174) #25433 [3.8] bpo-43723: Backport IDLE doc change (GH-25174) #25435

^{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 = 'https://github.com/JelleZijlstra'
closed_at = <Date 2021-04-12.12:07:13.169>
created_at = <Date 2021-04-04.01:01:50.964>
labels = ['library', '3.10']
title = 'Deprecate camelCase aliases from threading.py'
updated_at = <Date 2021-04-16.09:50:58.623>
user = 'https://github.com/JelleZijlstra'

bugs.python.org fields:

activity = <Date 2021-04-16.09:50:58.623>
actor = 'vstinner'
assignee = 'JelleZijlstra'
closed = True
closed_date = <Date 2021-04-12.12:07:13.169>
closer = 'vstinner'
components = ['Library (Lib)']
creation = <Date 2021-04-04.01:01:50.964>
creator = 'JelleZijlstra'
dependencies = []
files = []
hgrepos = []
issue_num = 43723
keywords = ['patch']
message_count = 16.0
messages = ['390165', '390166', '390337', '390442', '390826', '390833', '390837', '390840', '390843', '390845', '390846', '390847', '391167', '391169', '391179', '391180']
nosy_count = 8.0
nosy_names = ['rhettinger', 'terry.reedy', 'pitrou', 'vstinner', 'christian.heimes', 'JelleZijlstra', 'miss-islington', 'xtreak']
pr_nums = ['25174', '25361', '25432', '25433', '25435']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue43723'
versions = ['Python 3.10']