Add `stop all` to `--help` output

[tdukart]

Is your enhancement related to a problem? Please describe.

As a developer who often has to jump between different projects and environments, I didn't know that 10updocker stop all was an option to shut down the global Docker containers, so I was doing it through Docker Desktop. I just now ran across it in the README, although most of the time for a CLI tool I'll use --help instead.

I think it would be helpful for usability to add that sub-subcommand to the --help output, or potentially alias it to a stop-all subcommand so that it gets listed as a separate subcommand.

Designs

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Describe alternatives you've considered

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