Consider renaming --parent to --parents

Is your feature request related to a problem? Please describe

Just upgraded to 0.16. I noticed the --parent option with asdf set.

Now, the documentation/help text is actually clear, but from just the option, I thought it would set in the tool-version of the direct parent (which doesn't really make sense)

Describe the proposed solution

Change --parent in --parents

Describe similar asdf features and why they are not sufficient

asdf --parent

Describe other workarounds you've considered

not applicable