[issue21150] Add quick links table to argparse docs

[paul j3]

paul j3 added the comment:

While 'argparse' is complex, its organization is quite different from 'itertools'.  For most purposes there is one starting point:

    parser = argparse.ArgumentParser(...)

Nearly everything else invokes a 'parser'  method.  Most complex and common is 'add_argument'.

Some summary tables might be useful, but 'itertools' might not be best model.

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nosy: +paul.j3

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