[docs] [issue37908] Add some examples of ArgumentParser.exit()

[hai shi]

New submission from hai shi <shihai1991 at 126.com>:

As paul said in bpo 9938:
The exit and error methods are mentioned in the 3.4 documentation, but there are no examples of modifying them.

    16.4.5.9. Exiting methods
    ArgumentParser.exit(status=0, message=None)
    ArgumentParser.error(message)

I will update the examples in this weekend.

----------
assignee: docs at python
components: Documentation
messages: 350097
nosy: docs at python, shihai1991
priority: normal
severity: normal
status: open
title: Add some examples of ArgumentParser.exit()

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