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

[miss-islington]

Change by miss-islington <mariatta.wijaya+miss-islington at gmail.com>:


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nosy: +miss-islington
nosy_count: 3.0 -> 4.0
pull_requests: +24971
pull_request: https://github.com/python/cpython/pull/26379

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