Add test for all legal endpoints

[tmpayton]

What we’re after

We should increase test coverage for our two other legal endpoints: legal/citations and thelegal/docs.

Related ticket(s)

(Include the tickets that either came before, after, or are happening in tandem with this new ticket)

• Add case document tests to legal/search endpoint #6009

Action item(s)

(These are the smaller tasks that should happen in order to complete this work)

• [ ]

Completion criteria

(What does the end state look like - as long as this task(s) is done, this work is complete)

• [ ]

References/resources/technical considerations

(Is there sample code or a screenshot you can include to highlight a particular issue? Here is where you reinforce why this work is important)