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

[Alexey Izbyshev]

Change by Alexey Izbyshev <izbyshev at ispras.ru>:


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keywords: +patch
pull_requests: +8400
stage:  -> patch review

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