Fix mentions of the things the robot has

Author: PeterJCLaw

simulator/index.md

@@ -70,7 +70,7 @@ Within the Webots IDE, there are a few different panels:
 
 This is the pre-built robot used in the simulator, with an interface [similar](./programming) to the SR API.
 
-The robot has an array of sensors and a vision system, all of which can be [programmed](./programming).
+The robot has an [array of sensors](./programming/#ruggeduino) which can be [programmed](./programming) and a [radio system]({{ site.baseurl }}/programming/sr/radio/).
 
 ### Other robots