Move method comment to the header where it belongsc

src/libslic3r/Model.cpp

@@ -647,7 +647,6 @@ ModelMaterial* Model::add_material(t_model_material_id material_id, const ModelM
     return material;
 }
 
-// makes sure all objects have at least one instance
 bool Model::add_default_instances()
 {
     // apply a default position to all objects not having one

src/libslic3r/Model.hpp

@@ -1632,6 +1632,7 @@ public:
 
     void          delete_material(t_model_material_id material_id);
     void          clear_materials();
+    // Make sure all objects have at least one instance
     bool          add_default_instances();
     // Returns approximate axis aligned bounding box of this model.
     BoundingBoxf3 bounding_box_approx() const;