Cross-link to R.zone

Author: PeterJCLaw

programming/sr/radio/index.md

@@ -80,3 +80,5 @@ station_code
 
 owned_by
 : The zone id of the robot that currently owns the stations territory. A `None` value indicates an unclaimed territory.
+  <br>
+  Remember that you can find out which zone your robot is in using <a href="/docs/programming/sr/#OtherRobotAttributes"><code>R.zone</code></a>.