[docs] [issue12768] docstrings for the threading module

[moijes12]

moijes12 added the comment:

This patch was built on 3.2(I made the changes on the local repo after running command "hg up 3.2"). I've run the test suite and only test_site failed. This patch has some improvements over 12768_2.patch.

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Added file: http://bugs.python.org/file29330/12768_3.patch

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