The query functions in ReviewRequestManager are very old, and most

either lacked documentation or didn't meet current documentation

conventions.
As some work is being done in these functions, and given the importance

of these functions and their behavior, it's time to ensure they meet

documentation standards.
This updates the docstrings for all the query functions, making

behaviors and usage explicit.
No logic has changed.

Built the docs and checked through them. Didn't see anything

obvious or any build errors/warnings related to this file.