[docs] [issue15990] solidify argument/parameter terminology

[Roundup Robot]

Roundup Robot added the comment:

New changeset f44b8d69e5fc by Chris Jerdonek in branch '2.7':
Backport from 3.2: improve argument/parameter documentation (issue #15990).
http://hg.python.org/cpython/rev/f44b8d69e5fc

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nosy: +python-dev

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