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

[Steve Dower]

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

I think the docs are too specific about the mechanism used here - if we document *how* it works then we may not be able to make it work correctly (with a different mechanic) on a different platform.

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nosy: +steve.dower

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