AP_BattMonitor: Add docs for Plane QLand failsafe

libraries/AP_BattMonitor/AP_BattMonitor_Params.cpp

@@ -127,7 +127,7 @@ const AP_Param::GroupInfo AP_BattMonitor_Params::var_info[] = {
     // @Param: FS_LOW_ACT
     // @DisplayName: Low battery failsafe action
     // @Description: What action the vehicle should perform if it hits a low battery failsafe
-    // @Values{Plane}: 0:None,1:RTL,2:Land,3:Terminate
+    // @Values{Plane}: 0:None,1:RTL,2:Land,3:Terminate,4:QLand
     // @Values{Copter}: 0:None,1:Land,2:RTL,3:SmartRTL or RTL,4:SmartRTL or Land,5:Terminate
     // @Values{Sub}: 0:None,2:Disarm,3:Enter surface mode
     // @Values{Rover}: 0:None,1:RTL,2:Hold,3:SmartRTL,4:SmartRTL or Hold,5:Terminate
@@ -138,7 +138,7 @@ const AP_Param::GroupInfo AP_BattMonitor_Params::var_info[] = {
     // @Param: FS_CRT_ACT
     // @DisplayName: Critical battery failsafe action
     // @Description: What action the vehicle should perform if it hits a critical battery failsafe
-    // @Values{Plane}: 0:None,1:RTL,2:Land,3:Terminate
+    // @Values{Plane}: 0:None,1:RTL,2:Land,3:Terminate,4:QLand
     // @Values{Copter}: 0:None,1:Land,2:RTL,3:SmartRTL or RTL,4:SmartRTL or Land,5:Terminate
     // @Values{Sub}: 0:None,2:Disarm,3:Enter surface mode
     // @Values{Rover}: 0:None,1:RTL,2:Hold,3:SmartRTL,4:SmartRTL or Hold,5:Terminate