Minor GDScript fix

tutorials/physics/rigid_body.rst

@@ -33,17 +33,15 @@ Here is a custom ``look_at()`` function that will work reliably with rigid bodie
     extends RigidBody
 
     func look_follow(state, current_transform, target_position):
-	
-	var up_dir = Vector3(0, 1, 0);
+	var up_dir = Vector3(0, 1, 0)
 	var cur_dir = current_transform.basis.xform(Vector3(0, 0, 1))
 	var target_dir = (target_position - current_transform.origin).normalized()
 	var rotation_angle = acos(cur_dir.x) - acos(target_dir.x)
-	
+
 	state.set_angular_velocity(up_dir * (rotation_angle / state.get_step()))
 
     func _integrate_forces(state):
-	
-	var target_position = $"my_target_spatial_node".get_global_transform().origin
+	var target_position = $my_target_spatial_node.get_global_transform().origin
 	look_follow(state, get_global_transform(), target_position)
 
  .. code-tab:: csharp