[docs] [issue17375] Add docstrings to methods in the threading module

[Roundup Robot]

Roundup Robot added the comment:

New changeset e0ef2bde35c3 by Raymond Hettinger in branch '2.7':
Issue #17375:  Add docstrings to the threading module.
http://hg.python.org/cpython/rev/e0ef2bde35c3

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nosy: +python-dev

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