chore: normalize output help text

[neoeinstein]

Description

Normalizes the help text of the output command in the CLI so that it better matches the formatting of the other commands.

Testing done

N/A; simply a change to help output.

Reviewer checklist

• [ ] Ensure docs are updated if necessary. (eg. if a user visible feature is being added or changed).
• [ ] Ensure relevant issues are linked (description should include text like "Fixes #")

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[vvcephei]

Closing stale PR. I'm sorry that we didn't get this done. Please resubmit as a new PR if you still want to get it in.