📝 Update Driver Type comments

Author: thinkyhead

Marlin/Configuration.h

@@ -177,17 +177,18 @@
 //#define E7_DRIVER_TYPE A4988
 
 /**
- * Axis codes for additional axes:
- * This defines the axis code that is used in G-code commands to
- * reference a specific axis.
- * 'A' for rotational axis parallel to X
- * 'B' for rotational axis parallel to Y
- * 'C' for rotational axis parallel to Z
- * 'U' for secondary linear axis parallel to X
- * 'V' for secondary linear axis parallel to Y
- * 'W' for secondary linear axis parallel to Z
- * Regardless of the settings, firmware-internal axis IDs are
- * I (AXIS4), J (AXIS5), K (AXIS6).
+ * Additional Axis Settings
+ *
+ * AXISn_NAME defines the letter used to refer to the axis in (most) G-code commands.
+ * By convention the names and roles are typically:
+ *   'A' : Rotational axis parallel to X
+ *   'B' : Rotational axis parallel to Y
+ *   'C' : Rotational axis parallel to Z
+ *   'U' : Secondary linear axis parallel to X
+ *   'V' : Secondary linear axis parallel to Y
+ *   'W' : Secondary linear axis parallel to Z
+ *
+ * Regardless of these settings the axes are internally named I, J, K.
  */
 #ifdef I_DRIVER_TYPE
   #define AXIS4_NAME 'A' // :['A', 'B', 'C', 'U', 'V', 'W']