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

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset 5f18d9d34f73 by Brian Curtin in branch 'default':
Fix #15148. Make the shutil.which docstring more thorough
http://hg.python.org/cpython/rev/5f18d9d34f73

New changeset aa153b827d17 by Brian Curtin in branch 'default':
Fix #15148. Capitalize PATH, hopefully leading to less confusion
http://hg.python.org/cpython/rev/aa153b827d17

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<http://bugs.python.org/issue15148>
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