[issue17375] Add docstrings to methods in the threading module

[Roundup Robot]

Roundup Robot added the comment:

New changeset 24429118988b by Georg Brandl in branch '3.3':
Closes #17375: port new threading docstrings from 2.7.
http://hg.python.org/cpython/rev/24429118988b

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resolution:  -> fixed
stage:  -> committed/rejected
status: open -> closed

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<http://bugs.python.org/issue17375>
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