Copter: minor comment updates

No functional change

ArduCopter/control_althold.cpp

@@ -30,7 +30,7 @@ void Copter::althold_run()
     AltHoldModeState althold_state;
     float takeoff_climb_rate = 0.0f;
 
-    // initialize vertical speeds and leash lengths
+    // initialize vertical speeds and acceleration
     pos_control.set_speed_z(-g.pilot_velocity_z_max, g.pilot_velocity_z_max);
     pos_control.set_accel_z(g.pilot_accel_z);
 

ArduCopter/control_autotune.cpp

@@ -243,7 +243,7 @@ bool Copter::autotune_start(bool ignore_checks)
         return false;
     }
 
-    // initialize vertical speeds and leash lengths
+    // initialize vertical speeds and acceleration
     pos_control.set_speed_z(-g.pilot_velocity_z_max, g.pilot_velocity_z_max);
     pos_control.set_accel_z(g.pilot_accel_z);
 
@@ -262,7 +262,7 @@ void Copter::autotune_run()
     float target_yaw_rate;
     int16_t target_climb_rate;
 
-    // initialize vertical speeds and leash lengths
+    // initialize vertical speeds and acceleration
     pos_control.set_speed_z(-g.pilot_velocity_z_max, g.pilot_velocity_z_max);
     pos_control.set_accel_z(g.pilot_accel_z);
 

ArduCopter/control_poshold.cpp

@@ -82,7 +82,7 @@ bool Copter::poshold_init(bool ignore_checks)
         return false;
     }
     
-    // initialize vertical speeds and leash lengths
+    // initialize vertical speeds and acceleration
     pos_control.set_speed_z(-g.pilot_velocity_z_max, g.pilot_velocity_z_max);
     pos_control.set_accel_z(g.pilot_accel_z);
 
@@ -136,7 +136,7 @@ void Copter::poshold_run()
     float vel_fw, vel_right;            // vehicle's current velocity in body-frame forward and right directions
     const Vector3f& vel = inertial_nav.get_velocity();
 
-    // initialize vertical speeds and leash lengths
+    // initialize vertical speeds and acceleration
     pos_control.set_speed_z(-g.pilot_velocity_z_max, g.pilot_velocity_z_max);
     pos_control.set_accel_z(g.pilot_accel_z);