[docs] [issue8913] Document that datetime.__format__ is datetime.strftime

[Roundup Robot]

Roundup Robot added the comment:

New changeset 40f582a73901 by Ezio Melotti in branch '3.3':
#8913: add examples and docs for date/time/datetime.__format__.  Patch by Heikki Partanen.
http://hg.python.org/cpython/rev/40f582a73901

New changeset 8dd7f7134700 by Ezio Melotti in branch 'default':
#8913: merge with 3.3.
http://hg.python.org/cpython/rev/8dd7f7134700

New changeset 0dac103a41bb by Ezio Melotti in branch '2.7':
#8913: add examples and docs for date/time/datetime.__format__.  Patch by Heikki Partanen.
http://hg.python.org/cpython/rev/0dac103a41bb

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nosy: +python-dev

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