[issue39976] Add "**other_popen_kwargs" to subprocess API signatures in docs

[Zackery Spytz]

Change by Zackery Spytz <zspytz at gmail.com>:


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keywords: +patch
nosy: +ZackerySpytz
nosy_count: 2.0 -> 3.0
pull_requests: +19450
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/20145

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39976>
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