[docs] [issue30974] Update os.samefile docstring to match documentation

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

I'm not personally thrilled about it being documented like this, but it's certainly how the current documentation reads. Consistency is better until we get motivated enough to fix all of it.

Thanks for the patch!

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stage: patch review -> backport needed

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