[docs] [issue21150] Add quick links table to argparse docs

[Susan Su]

Susan Su <susansu.software at gmail.com> added the comment:

I'm available to start working on this bug. Please let me know if any suggestions, concerns or comments come up! Thank you.

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nosy: +suhearsawho

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue21150>
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