AC_AttitudeControl: add missing parameter metadata

libraries/AC_AttitudeControl/AC_AttitudeControl_Multi.cpp

@@ -42,6 +42,7 @@ const AP_Param::GroupInfo AC_AttitudeControl_Multi::var_info[] = {
     // @Range: 1 100
     // @Increment: 1
     // @Units: Hz
+    // @User: Standard
     AP_SUBGROUPINFO(_pid_rate_roll, "RAT_RLL_", 1, AC_AttitudeControl_Multi, AC_PID),
 
     // @Param: RAT_PIT_P
@@ -79,6 +80,7 @@ const AP_Param::GroupInfo AC_AttitudeControl_Multi::var_info[] = {
     // @Range: 1 100
     // @Increment: 1
     // @Units: Hz
+    // @User: Standard
     AP_SUBGROUPINFO(_pid_rate_pitch, "RAT_PIT_", 2, AC_AttitudeControl_Multi, AC_PID),
 
     // @Param: RAT_YAW_P
@@ -116,6 +118,7 @@ const AP_Param::GroupInfo AC_AttitudeControl_Multi::var_info[] = {
     // @Range: 1 100
     // @Increment: 1
     // @Units: Hz
+    // @User: Standard
     AP_SUBGROUPINFO(_pid_rate_yaw, "RAT_YAW_", 3, AC_AttitudeControl_Multi, AC_PID),
 
     // @Param: THR_MIX_MIN