[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>:


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pull_requests: +11135, 11136, 11137, 11139

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