AC_AttitudeControl: minor comment update

Non-functional change

libraries/AC_AttitudeControl/AC_AttitudeControl.h

@@ -332,7 +332,7 @@ protected:
     // Intersampling period in seconds
     float               _dt;
 
-    // This represents a 321-intrinsic rotation from NED frame to the target (setpoint)
+    // This represents a 321-intrinsic rotation in NED frame to the target (setpoint)
     // attitude used in the attitude controller, in radians.
     Vector3f            _attitude_target_euler_angle;
 
@@ -341,7 +341,7 @@ protected:
     // second.
     Vector3f            _attitude_target_euler_rate;
 
-    // This represents a quaternion rotation from NED frame to the target (setpoint)
+    // This represents a quaternion rotation in NED frame to the target (setpoint)
     // attitude used in the attitude controller.
     Quaternion          _attitude_target_quat;
 
@@ -350,7 +350,7 @@ protected:
     // the target attitude frame.
     Vector3f            _attitude_target_ang_vel;
 
-    // This represents the angular velocity in radians per second, used in the angular
+    // This represents the angular velocity in radians per second in the body frame, used in the angular
     // velocity controller.
     Vector3f            _rate_target_ang_vel;