Some cleanup of st_get_pos functions

Marlin/planner.cpp

@@ -1090,6 +1090,12 @@ float junction_deviation = 0.1;
 } // plan_buffer_line()
 
 #if ENABLED(AUTO_BED_LEVELING_FEATURE) && DISABLED(DELTA)
+
+  /**
+   * Get the XYZ position of the steppers as a vector_3.
+   *
+   * On CORE machines XYZ is derived from ABC.
+   */
   vector_3 plan_get_position() {
     vector_3 position = vector_3(st_get_axis_position_mm(X_AXIS), st_get_axis_position_mm(Y_AXIS), st_get_axis_position_mm(Z_AXIS));
 
@@ -1102,8 +1108,14 @@ float junction_deviation = 0.1;
 
     return position;
   }
+
 #endif // AUTO_BED_LEVELING_FEATURE && !DELTA
 
+/**
+ * Directly set the planner XYZ position (hence the stepper positions).
+ *
+ * On CORE machines stepper ABC will be translated from the given XYZ.
+ */
 #if ENABLED(AUTO_BED_LEVELING_FEATURE) || ENABLED(MESH_BED_LEVELING)
   void plan_set_position(float x, float y, float z, const float& e)
 #else