[docs] [issue30420] Clarify kwarg handing for subprocess convenience APIs

[Martin Panter]

Martin Panter added the comment:

If you add “cwd” to Frequently Use Arguments, please try to keep the details in one place. Otherwise you encourage a fix for Issue 15533 (cwd platform specifics) to repeat the problem of Issue 20344 (args vs shell platform specifics), where some details are only found in one section and contradict the other section.

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<http://bugs.python.org/issue30420>
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