L2SS-846: fix docs

tangostationcontrol/docs/source/devices/using.rst

@@ -53,6 +53,7 @@ The state of a device is then queried with ``device.state()``. Each device can b
         standby -> disable [label = "user", color="green"];
         on -> disable [label = "user", color="green"];
         alarm -> disable [label = "user", color="green"];
+        disable -> off [label= "user", color="red"];
     }