Try fix some mover jank (#13503)

Content.Shared/Movement/Components/MovementRelayTargetComponent.cs

@@ -5,6 +5,11 @@ namespace Content.Shared.Movement.Components;
 [RegisterComponent, NetworkedComponent]
 public sealed class MovementRelayTargetComponent : Component
 {
+    // This really shouldn't be a list at the moment. Its just not supported.
+    // Neither movement updating, nor HandleDirChange() support more than one mover.
+    // Its currently possible for the direction to be set by one mover and the relative rotation to be set by a separate unrelated mover.
+    // AAAAA
+
     /// <summary>
     /// Entities that are relaying to us.
     /// </summary>