Update doc

Author: maxGimeno

Three/include/CGAL/Three/Scene_item.h

@@ -76,6 +76,11 @@ class SCENE_ITEM_EXPORT Scene_item : public QObject{
     NORMALS  = 0x4,                     //!< Invalidate the normal of each vertex.
     ALL      = GEOMETRY|COLORS|NORMALS  //!< Invalidate everything
   };
+
+#ifdef DOXYGEN_RUNNING
+  //! \brief Flag interface for Scene_item::Gl_data_name.
+  enum Gl_data_names{};
+#endif
   Q_DECLARE_FLAGS(Gl_data_names, Gl_data_name)
 
   //! \brief The default color of a scene_item.