Update common-ais.rst

Add reference to AIS_TYPE.

common/source/docs/common-ais.rst

@@ -30,7 +30,7 @@ Autopilot Configuration
 
 Connect to the autopilot with a ground station and set these parameters and then reboot the autopilot
 
-- AIS_TYPE = 1 (Enable)
+- :ref:`AIS_TYPE <AIS_TYPE>` = 1 (NMEA AIVDM message)
 - :ref:`SERIAL1_PROTOCOL <SERIAL1_PROTOCOL>` = 40 (AIS) if the sensor is connected to serial port 1.  If another serial port is used please set the appropriate SERIALx_PROTOCOL parameter
 - :ref:`SERIAL1_BAUD <SERIAL1_BAUD>` = 38 (38400 bps) if using serial port 1.  If another serial port is used please set the appropriate SERIALx_BAUD parameter instead
 - :ref:`SR0_ADSB <SR0_ADSB>` = 5 to enable sending AIS mavlink messages to the ground station over Serial0 (the USB port).  If a telemetry radio is used the SRx_ADSB param corresponding to its serial port should also be set to 5(Hz).