[docs] [issue24013] Improve os.scandir() and DirEntry documentation

[STINNER Victor]

STINNER Victor added the comment:

> 8. Added "Availability: Unix, Windows." to scandir docs like listdir and most other os functions have.

That's wrong: availability should only be explained when a function is not always available. os.listdir() and os.scandir() are always available. I made the opposite change: I removed the availability information from os.listdir() and many other os functions in the changeset 77ebd3720284.

Thanks Ben, I applied your patch (except of the Availability line).

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