Use a better times symbol

Author: PeterJCLaw

kit/index.md

@@ -17,7 +17,7 @@ The boards provided are as follows; more details can be found on their individua
 
  * [Brain Board](/docs/kit/brain_board)
  * [Power Board](/docs/kit/power_board)
- * [Motor Board x2](/docs/kit/motor_board)
+ * [Motor Board ×2](/docs/kit/motor_board)
  * [Arduino (including two screw shields)](/docs/kit/arduino)
  * [Servo Board](/docs/kit/servo_board)