Avoid the generic terminology used for term and meta subcommand descriptions

[johnbillion]

The descriptions for the second-level subcommands of wp post|user term|meta use generic "object" terminology from the method docblocks in the abstract CommandWithTerms and CommandWithMeta classes. For example:

• wp post term --help correctly says "Adds, updates, removes, and lists post terms."
• wp post term list --help uses the generic phrase "List all terms associated with an object."

Generic terminology is used for all four term and meta subcommands:

wp (post|user) (term|meta) (add|list|remove|set) --help

It would be great if the descriptions and argument synopses for these commands didn't use generic terminology.

[schlessera]

This is because most of the code is in a shared abstract class, so the docblocks only exist once for all "objects".

I agree that it would be preferable to get rid of the generic terms, though. I'll have a look to see how best to achieve that without copying the logic around.