[docs] [issue14034] Add argparse howto

[Steven Bethard]

Steven Bethard <steven.bethard at gmail.com> added the comment:

I have no objections on adding a howto, and something like the attached patch would be fine with me (though I don't have time to review it in full and trust you to).

You might want to coordinate with Issue 13850 a bit - they want a quick reference table before the first example (which would therefore mean before this howto which is replacing the first example).

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