[docs] [issue37073] clarify functions docs in IO modules and Bytes Objects

[Windson Yang]

Change by Windson Yang <wiwindson at outlook.com>:


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keywords: +patch
pull_requests: +13600
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/13713

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37073>
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