Apply suggestions from code review

Co-authored-by: Peter Law <[email protected]>

Author: WillB97

programming/sr/ruggeduinos/custom_firmware.md

@@ -25,9 +25,9 @@ If you're using completely custom firmware, you'll need to tell the kit to ignor
 [Extension of the SR firmware](#extension) {#extension}
 ------------------------------
 
-<div class="warning">
+<div class="warning" markdown="1">
 Because the API sets all pins to inputs when the robot is initialised, you cannot set pin modes in the setup function as these will be overridden.
-In order to setup pins you can either create a function on the ruggeduino that you call after your robot is initialised or use the [python functions](/docs/programming/sr/ruggeduinos/) to setup the pins. 
+In order to setup pins you can either create a function on the ruggeduino that you call after your robot is initialised or use the [python functions](/docs/programming/sr/ruggeduinos/#pin-modes) to setup the pins.
 </div>
 
 You may wish to extend the SR firmware with additional functionality.