[issue41147] Document that redirect_std{out, err} yield the new stream as the context variable

[Irit Katriel]

Change by Irit Katriel <iritkatriel at yahoo.com>:


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versions: +Python 3.10, Python 3.11, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41147>
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