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

[Nick Coghlan]

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

Well, that forward port was definitely more complicated than I expected.

Additional reviews of both 3.2 and 3.3 (i.e. default) would be appreciated - there were quite a few adjustments needed to cope with changes between 2.7 and 3.2 and then additional changes between 3.2 and 3.3.

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