Remove outdated comment

source/blender/makesdna/DNA_modifier_types.h

@@ -3084,15 +3084,12 @@ typedef struct GreasePencilLineartModifierData {
   struct Object *source_object;
   struct Collection *source_collection;
 
-  /* These are redundant in GPv3, see above for explanations. */
   struct Material *target_material;
   char target_layer[64];
 
   /**
    * These two variables are to pass on vertex group information from mesh to strokes.
    * `vgname` specifies which vertex groups our strokes from source_vertex_group will go to.
-   *
-   * These are redundant in GPv3, see above for explanations.
    */
   char source_vertex_group[64];
   char vgname[64];