[docs] [issue34914] Clarify text encoding used to enable UTF-8 mode

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

Your explanation is why this is a docs enhancement proposal rather than a
bug report: as far as we're aware, all encodings that get used as locale
encodings have the property that encoding "-X utf8" with the locale
encoding gives the same answer as encoding it with ASCII.

Encodings where this isn't true (like UTF-16-LE) don't get used as locale
encodings.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34914>
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