[docs] [issue15148] shutil.which() docstring could be clearer

[Brian Curtin]

Brian Curtin <brian at python.org> added the comment:

I updated file to command in 973b4806f760. It needs to be command so it matches the implementation's argument name, and because it doesn't exactly take a file.

Alexander, can you explain the part about finding a file on PYTHONPATH? I don't think this has anything to do with shutil.which, or at least I have no idea how it would.

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