Plane: modify FENCE_AUTOENABLE docs

ArduPlane/Parameters.cpp

@@ -328,8 +328,8 @@ const AP_Param::Info Plane::var_info[] = {
 
     // @Param: FENCE_AUTOENABLE
     // @DisplayName: Fence automatic enable
-    // @Description: When set to 1, geofence automatically enables after an auto takeoff and automatically disables at the beginning of an auto landing.  When on the ground before takeoff the fence is disabled.  When set to 2, the fence autoenables after an auto takeoff, but only disables the fence floor during landing. It is highly recommended to not use this option for line of sight flying and use a fence enable channel instead. When set to 3 the fence auto-enables when te vehicle is armed, and arming will fail if the fence cannot be enabled or is outside the fence. Option 3 cannot be used with a non-zero FENCE_MINALT
-    // @Values: 0:NoAutoEnable,1:AutoEnable,2:AutoEnableDisableFloorOnly,3:AutoEnableArming
+    // @Description: When set to 1, geofence automatically enables after an auto takeoff and automatically disables at the beginning of an auto landing.  When on the ground before takeoff the fence is disabled.  When set to 2, the fence autoenables after an auto takeoff, but only disables the fence floor during landing. It is highly recommended to not use this option for line of sight flying and use a fence enable channel instead. When set to 3 the fence auto-enables when the vehicle is armed and disables when disarmed and arming will fail if the fence cannot be enabled or is outside the fence. Option 3 cannot be used with a non-zero FENCE_MINALT
+    // @Values: 0:NoAutoEnable,1:AutoEnable,2:AutoEnableDisableFloorOnly,3:EnableWhenArmed
     // @User: Standard
     GSCALAR(fence_autoenable,       "FENCE_AUTOENABLE", 0),