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

[Nick Coghlan]

Nick Coghlan added the comment:

The just merged PR covers the "list `cwd` in the nominal signatures for `run()`, `call()`, `check_call()`, and `check_output()`" part of the proposal.

The rest of the proposed fixes are still pending a patch (and keeping in mind Martin's caveat on minimising duplication between the "Frequently Used Arguments" section and the full Popen documentation)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30420>
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