Fix for mistake with const for non pointer/reference with corrections in documentation.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@35797 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/brush.h

@@ -51,7 +51,7 @@ public:
     wxBitmap *GetStipple() const;
 
     void SetColour( const wxColour& col );
-    void SetColour( const unsigned char r, const unsigned char g, const unsigned char b );
+    void SetColour( unsigned char r, unsigned char g, unsigned char b );
     void SetStyle( int style );
     void SetStipple( const wxBitmap& stipple );