[issue41857] Document timeout arguments to poll() in select module

[Tal Einat]

Change by Tal Einat <taleinat+python at gmail.com>:


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pull_requests: +28929
pull_request: https://github.com/python/cpython/pull/30742

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41857>
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