Comment a motion function

Marlin/src/module/motion.cpp

@@ -348,6 +348,11 @@ void line_to_current_position(const feedRate_t &fr_mm_s/*=feedrate_mm_s*/) {
 
 #endif // IS_KINEMATIC
 
+/**
+ * Do a fast or normal move to 'destination' with an optional FR.
+ *  - Move at normal speed regardless of feedrate percentage.
+ *  - Extrude the specified length regardless of flow percentage.
+ */
 void _internal_move_to_destination(const feedRate_t &fr_mm_s/*=0.0f*/
   #if IS_KINEMATIC
     , const bool is_fast/*=false*/