[issue41203] Replace references to OS X in documentation with macOS

[Patrick Reader]

Change by Patrick Reader <pxeger at protonmail.com>:


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keywords: +patch
pull_requests: +20468
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/21316

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41203>
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