[docs] [issue21752] Document Backwards Incompatible change to logging in 3.4

[Roundup Robot]

Roundup Robot added the comment:

New changeset 277d099a134b by Vinay Sajip in branch '3.4':
Issue #21752: Documented change to behaviour of logging.getLevelName().
http://hg.python.org/cpython/rev/277d099a134b

New changeset 174c30103b57 by Vinay Sajip in branch 'default':
Closes #21752: Merged update from 3.4.
http://hg.python.org/cpython/rev/174c30103b57

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nosy: +python-dev
resolution:  -> fixed
stage:  -> resolved
status: open -> closed

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