docs(cli): add example argo archive list-label-keys

[Junseokee]

Fixes #11898

Motivation
Modify the argo archive list-label-keys command for more information

Modifications
Added examples for the argo archive list-label-keys command.

Verification
run argo archive list-label-keys -h

[agilgur5]

Similar to #13707 (comment), it looks like this is a near verbatim copy of #13676? If you are copying someone else's code, title, or description, please make sure to cite and credit your source. This makes no mention of #13676 currently, while copying its description entirely yet missing all the formatting (the title and description are therefore worse than the formatted and edited ones as well). DCO is also failing here

@leehosu was this done with your permission?

[leehosu]

@agilgur5 Yes, as mentioned in #13682 (comment), I am leading the open source project of argoproj in Korea, and I am providing a guide to those who contribute for the first time. This PR was also done under my guide.

[agilgur5]

Thanks for confirming. I figured since you commented in #13707 (comment) that it was, but as you were not mentioned in the PR description, it was not clear.

Thanks for encouraging more people to contribute! If it's attributed correctly (you should be co-author and your PR linked) and passes CI, I'm happy to merge these. I'm not against merging your original PRs either, but I appreciate you trying to get others involved