[issue14486] Add some versionchanged notes in threading docs

[Roundup Robot]

Roundup Robot added the comment:

New changeset 81c28c415718 by Georg Brandl in branch '2.7':
Closes #14486: add versionchanged notices throughout the threading docs for PEP8-compliant APIs; the note at the top of the page is too hard to notice.
http://hg.python.org/cpython/rev/81c28c415718

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nosy: +python-dev
resolution:  -> fixed
stage: needs patch -> committed/rejected
status: open -> closed

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