[docs] [issue12043] Update shutil documentation

[Roundup Robot]

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

New changeset 6bf168b55d07 by Éric Araujo in branch '2.7':
Update documentation for shutil.move (#12043) and fix a few typos.
http://hg.python.org/cpython/rev/6bf168b55d07

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