I'm not exactly sure how to do this or if Doxyclean supports it. Investigation is needed.
After further investigation, it appears that Doxyclean isn't carrying these across. I've been meaning to make my own. Probably my next project after I finish documenting the rest of SSToolkit.
* Started documenting SSDrawingUtilities. #23
* Documented enums. Fixes #22
* Documented UIImage category. #24