RC_Channel: add DroneCAN, MAVRadio to RC_PROTOCOLS description

Author: olliw42

libraries/RC_Channel/RC_Channels_VarInfo.h

@@ -101,7 +101,7 @@ const AP_Param::GroupInfo RC_Channels::var_info[] = {
     // @DisplayName: RC protocols enabled
     // @Description: Bitmask of enabled RC protocols. Allows narrowing the protocol detection to only specific types of RC receivers which can avoid issues with incorrect detection. Set to 1 to enable all protocols.
     // @User: Advanced
-    // @Bitmask: 0:All,1:PPM,2:IBUS,3:SBUS,4:SBUS_NI,5:DSM,6:SUMD,7:SRXL,8:SRXL2,9:CRSF,10:ST24,11:FPORT,12:FPORT2,13:FastSBUS
+    // @Bitmask: 0:All,1:PPM,2:IBUS,3:SBUS,4:SBUS_NI,5:DSM,6:SUMD,7:SRXL,8:SRXL2,9:CRSF,10:ST24,11:FPORT,12:FPORT2,13:FastSBUS,14:DroneCAN,15:MAVRadio
     AP_GROUPINFO("_PROTOCOLS", 34, RC_CHANNELS_SUBCLASS, _protocols, 1),
 
     // @Param: _FS_TIMEOUT