Adding addon board motor direction

docs/source/understand/add-on-board/add-on-board.rst

@@ -20,6 +20,11 @@ The add-on board connects a few components directly to the Raspberry Pi GPIOs as
 
 * Button on GPIO 6
 * LED on GPIO 26
-* Motor controls on GPIO 17, 22, 23 and 25
+* Motor controls
+
+    * Motor 1: GPIO 23 for direction 1, GPIO 25 for direction 2
+    
+    * Motor 2: GPIO 17 for direction 1, GPIO 22 for direction 2
+
 * Servo motors on GPIO 18 and 13
 * Speed sensors on GPIO 4 and 16
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