[issue45275] Make argparse print description of subcommand when invoke help doc on subcommand

[paul j3]

paul j3 <ajipanca at gmail.com> added the comment:

Are you expecting the subcommand help to show the 'help' line that the main help shows?

    subparsers.add_parser('a', help='a help')

add_parser takes all of the parameters that `ArgumentParser` takes, including description and epilog.  

I don't think we need to add anything to add_parser.

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nosy: +paul.j3

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