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

[miss-islington]

Change by miss-islington <mariatta.wijaya+miss-islington at gmail.com>:


----------
pull_requests: +11134, 11135, 11136

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