[docs] [issue34512] Document platform-specific strftime() behavior for non-ASCII format strings

[Tal Einat]

Change by Tal Einat <taleinat at gmail.com>:


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions:  -Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34512>
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