Fix the syntax for some status-related documentation introduced in [30155].

* Variables in DocBlocks should be backtick-escaped
* Parameter and return types should be as specific as possible
* `@param` types and variables should align with each other, but not intentionally with the `@return` description

See #30230.


git-svn-id: https://develop.svn.wordpress.org/trunk@30284 602fd350-edb4-49c9-b593-d223f7449a82