Plane: Update description for Q_BCK_PIT_LIM

ArduPlane/quadplane.cpp

@@ -531,7 +531,7 @@ const AP_Param::GroupInfo QuadPlane::var_info2[] = {
 
     // @Param: BCK_PIT_LIM
     // @DisplayName: Q mode rearward pitch limit
-    // @Description: This sets the maximum number of degrees of back or pitch up in Q modes when the airspeed is at AIRSPEED_MIN and is used to prevent excessive sutructural loads when pitching up decelerate. If airspeed is above or below AIRSPEED_FBW_MIN the pitch up/back will be adjusted according to the formula pitch_limit = BCK_PIT_LIM * (AIRSPEED_FBW_MIN / IAS)^2. The backwards/up pitch limit controlled by this parameter is in addition to limiting applied by PTCH_LIM_MAX and Q_ANGLE_MAX. The BCK_PIT_LIM limit is only applied when Q_FWD_THR_USE is set to 1 or 2 and the vehicle is flying in a mode that uses forward throttle instead of forward tilt to generate forward speed. Set to a non positive value 0 to deactivate this limit.
+    // @Description: This sets the maximum number of degrees of back or pitch up in Q modes when the airspeed is at AIRSPEED_MIN, and is used to prevent excessive sutructural loads when pitching up decelerate. If airspeed is above or below AIRSPEED_MIN, the pitch up/back will be adjusted according to the formula pitch_limit = Q_BCK_PIT_LIM * (AIRSPEED_MIN / IAS)^2. The backwards/up pitch limit controlled by this parameter is in addition to limiting applied by PTCH_LIM_MAX_DEG and Q_ANGLE_MAX. The BCK_PIT_LIM limit is only applied when Q_FWD_THR_USE is set to 1 or 2 and the vehicle is flying in a mode that uses forward throttle instead of forward tilt to generate forward speed. Set to a non positive value 0 to deactivate this limit.
     // @Units: deg
     // @Range: 0.0 15.0
     // @Increment: 0.1