[docs] [issue39287] Document UTF-8 mode in the using/windows.

Jan. 28, 2020


      Change by Inada Naoki <songofacandy@gmail.com>:


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report@bugs.python.org>
<https://bugs.python.org/issue39287>
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