Remove non-special comments

Marlin/src/gcode/motion/G2_G3.cpp

     planner.buffer_line_kinematic(cart, fr_mm_s, active_extruder);
   #endif
 
-  // As far as the parser is concerned, the position is now == target. In reality the
-  // motion control system might still be processing the action and the real tool position
-  // in any intermediate location.
   COPY(current_position, cart);
 } // plan_arc
 

Marlin/src/gcode/motion/G5.cpp

 
 void plan_cubic_move(const float (&cart)[XYZE], const float (&offset)[4]) {
   cubic_b_spline(current_position, cart, offset, MMS_SCALED(feedrate_mm_s), active_extruder);
-
-  // As far as the parser is concerned, the position is now == destination. In reality the
-  // motion control system might still be processing the action and the real tool position
-  // in any intermediate location.
   COPY(current_position, cart);
 }