[docs] [issue34502] Docs of sys.exit() mention utf8_mode for an unclear reason

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

Yes, it's a note for sys.flags. Can you please add it back to sys.flags?

Sorry, I added the note at the wrong place.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34502>
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