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

[Martin Panter]

Martin Panter added the comment:

For the curious, Nick added the “frequently used arguments” in Issue 13237. Before that the signatures were like <https://docs.python.org/release/3.2.2/library/subprocess.html#convenience-functions>:

subprocess.call(*popenargs, **kwargs)

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nosy: +martin.panter

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