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

[Nick Coghlan]

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

I'm reasonably happy with the changes I just checked in, but rather than doing multiple forward ports, my plan is to let them settle for a while, update them based on any feedback I get, then incorporate the final version into the 3.x series.

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