Plane: update USE_REV_THR param description to include landing pattern

ArduPlane/Parameters.cpp

@@ -216,7 +216,7 @@ const AP_Param::Info Plane::var_info[] = {
     // @DisplayName: Bitmask for when to allow negative reverse thrust
     // @Description: This controls when to use reverse thrust. If set to zero then reverse thrust is never used. If set to a non-zero value then the bits correspond to flight stages where reverse thrust may be used. Note that reverse thrust is only ever auto-enabled in auto-throttle modes. In modes where throttle control is pilot controlled the ability to do reverse thrust is controlled by throttle stick input. The most commonly used value for USE_REV_THRUST is 2, which means AUTO_LAND only. That enables reverse thrust in the landing stage of AUTO mode. Another common choice is 1, which means to use reverse thrust in all auto flight stages.
     // @Values: 0:Never,1:AutoAlways,2:AutoLanding
-    // @Bitmask: 0:AUTO_ALWAYS,1:AUTO_LAND,2:AUTO_LOITER_TO_ALT,3:AUTO_LOITER_ALL,4:AUTO_WAYPOINTS,5:LOITER,6:RTL,7:CIRCLE,8:CRUISE,9:FBWB,10:GUIDED
+    // @Bitmask: 0:AUTO_ALWAYS,1:AUTO_LAND,2:AUTO_LOITER_TO_ALT,3:AUTO_LOITER_ALL,4:AUTO_WAYPOINTS,5:LOITER,6:RTL,7:CIRCLE,8:CRUISE,9:FBWB,10:GUIDED,11:AUTO_LANDING_PATTERN
     // @User: Advanced
     GSCALAR(use_reverse_thrust,     "USE_REV_THRUST",  USE_REVERSE_THRUST_AUTO_LAND_APPROACH),