fix for doxygen warnings

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56084 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/cmndata.h

@@ -418,6 +418,8 @@ public:
         @param i
             An integer between 0 and 15 for whatever custom colour you want to
             set. The default custom colours are invalid colours.
+        @param colour
+            The colour to set
     */
     void SetCustomColour(int i, const wxColour& colour);