[4.0] Cleanup of controller based on Intellij highlighting #28315
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Summary of Changes
I was very tired this evening so I did what any sane person would normally do when they're tired. Get inspired by their editor to go cleanup doc blocks, return types etc in all the Joomla controllers in J4 (this wasn't automated before those moan based on the title - i just used the highlighting as a point to review)
Testing Instructions
Code Review
Documentation Changes Required
None. This improves the incode documentation to match reality