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

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

Surely there are already good places to help with 2->3 transition?
The Library Reference is not such a place.

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nosy: +amaury.forgeotdarc

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17860>
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