[docs] [issue13237] subprocess docs should emphasise convenience functions

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

That's deliberate, as I'm only showing a selected subset of the full
signature at that point and using the subprocess API's with positional
arguments would lead to almost incomprehensible code. I'm not in any great
hurry to forward port though, so I'm happy to wait until you get a chance to
review the changes.

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<http://bugs.python.org/issue13237>
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