Cleanup: spelling in comments, capitalize tags

Also add missing task-ID reference & remove colon after \note as it
doesn't render properly in doxygen.

source/blender/editors/include/ED_screen.h

@@ -666,7 +666,7 @@ bool ED_region_panel_category_gutter_calc_rect(const ARegion *region, rcti *r_re
 bool ED_region_panel_category_gutter_isect_xy(const ARegion *region, const int event_xy[2]);
 
 /**
- * \note: This may return true for multiple overlapping regions.
+ * \note This may return true for multiple overlapping regions.
  * If it matters, check overlapped regions first (#ARegion.overlap).
  */
 bool ED_region_contains_xy(const struct ARegion *region, const int event_xy[2]);