gh-91156: Document how TextIOWrapper interacts with UTF-8 mode (GH-132885)

Document how TextIOWrapper interacts with UTF-8 mode
(cherry picked from commit 245cd6c532)

Co-authored-by: Malcolm Smith <smith@chaquo.com>
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Miss Islington (bot) 2025-05-03 04:38:35 +02:00 committed by GitHub
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@ -950,7 +950,8 @@ Text I/O
:class:`TextIOBase`.
*encoding* gives the name of the encoding that the stream will be decoded or
encoded with. It defaults to :func:`locale.getencoding`.
encoded with. In :ref:`UTF-8 Mode <utf8-mode>`, this defaults to UTF-8.
Otherwise, it defaults to :func:`locale.getencoding`.
``encoding="locale"`` can be used to specify the current locale's encoding
explicitly. See :ref:`io-text-encoding` for more information.