[docs] [issue17860] subprocess docs lack info how to use output result

[Roundup Robot]

Roundup Robot added the comment:

New changeset f4747e1ce2b1 by Ronald Oussoren in branch '3.3':
Cleanup of documentation change from #17860
http://hg.python.org/cpython/rev/f4747e1ce2b1

New changeset 83810f67d16b by Ronald Oussoren in branch 'default':
(3.3->default) Cleanup of documentation change from #17860
http://hg.python.org/cpython/rev/83810f67d16b

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