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

[Alexander Belopolsky]

Alexander Belopolsky <alexander.belopolsky at gmail.com> added the comment:

> Alexander, can you explain the part about finding a file on PYTHONPATH?

I thought about something like this:

>>> shutil.which('shutil.py', os.F_OK, ':'.join(sys.path))
'/Users/sasha/Work/python-hg/py3k/Lib/shutil.py'

but win32 code seems to assume a search for a command.

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