AC_AttitudeControl: remove old RAT_FILT param desc

libraries/AC_AttitudeControl/AC_AttitudeControl_Multi.cpp

@@ -211,30 +211,6 @@ const AP_Param::GroupInfo AC_AttitudeControl_Multi::var_info[] = {
     // @User: Advanced
     AP_GROUPINFO("THR_MIX_MAN", 6, AC_AttitudeControl_Multi, _thr_mix_man, AC_ATTITUDE_CONTROL_MAN_DEFAULT),
 
-    // @Param: RAT_RLL_FILT
-    // @DisplayName: Roll axis rate controller input frequency in Hz
-    // @Description: Roll axis rate controller input frequency in Hz
-    // @Range: 1 100
-    // @Increment: 1
-    // @Units: Hz
-    // @User: Standard
-
-    // @Param: RAT_PIT_FILT
-    // @DisplayName: Pitch axis rate controller input frequency in Hz
-    // @Description: Pitch axis rate controller input frequency in Hz
-    // @Range: 1 100
-    // @Increment: 1
-    // @Units: Hz
-    // @User: Standard
-
-    // @Param: RAT_YAW_FILT
-    // @DisplayName: Yaw axis rate controller input frequency in Hz
-    // @Description: Yaw axis rate controller input frequency in Hz
-    // @Range: 1 10
-    // @Increment: 1
-    // @Units: Hz
-    // @User: Standard
-
     AP_GROUPEND
 };