[docs] [issue11794] Backport new logging docs to 2.7

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset 6fb033af9310 by Vinay Sajip in branch '2.7':
Issue #11794: Reorganised logging documentation.
http://hg.python.org/cpython/rev/6fb033af9310

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nosy: +python-dev

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