[docs] [issue12768] docstrings for the threading module

[Graeme Cross]

Graeme Cross <gjcross at gmail.com> added the comment:

I will check that the patch works with 3.2; if not, I'll redo the patch for 3.2.
I will also incorporate the review changes from Ezio and Eric.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12768>
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