[docs] [issue37908] Add an example of ArgumentParser.exit()

[Stéphane Wirtel]

Stéphane Wirtel <stephane at wirtel.be> added the comment:

Thank you

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions: +Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37908>
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