docs(cli): add examples for argo archive list-label-values with option explanations

[leehosu]

Fixes #11898

Motivation

Modify the argo archive list-label-values command for more information

Modifications

Added examples for the argo archive list-label-values command.

Verification

run argo archive list-label-values -h

[agilgur5]

Thanks for contributing these PRs @leehosu.

Could I ask that you pick up other issues to contribute to now that you've done some of these already? Per #11898 (comment), these were intended as quick contributions for different contributors to get started with the codebase as a light introduction.
Now that you've learned it a bit, I would encourage you to take on some other issues and learn and try more.

[leehosu]

@agilgur5
I am participating in the open-source community in South Korea. I wanted to complete the argo archive to explain and encourage people who want to contribute at first time. But since you have your intention, can archive side be merged with my PR? I think I want to complete the archive and help others.