Fix typo for Telemetry in remote-control-cleanup (#2272)

Nothing major as it's going to be removed anyway to finish the exercise,
but it's still a typo.

exercises/concept/remote-control-cleanup/RemoteControlCleanup.cs

@@ -6,7 +6,7 @@ public class RemoteControlCar
 
     // TODO encapsulate the methods suffixed with "_Telemetry" in their own class
     // dropping the suffix from the method name
-    public void Calibrate_Telementry()
+    public void Calibrate_Telemetry()
     {
 
     }