docs: updated physics interface delta parameter comment

Engine.Physics2D/Abstract/Updates/IPhysicsUpdate.cs

@@ -10,6 +10,6 @@ public interface IPhysicsUpdate : IBehaviour
     /// <summary>
     /// Updates the physics state of the object based on the elapsed time since the last update.
     /// </summary>
-    /// <param name="delta">The time elapsed since the last physics update, typically in seconds.</param>
+    /// <param name="delta">The time elapsed since the last physics update.</param>
     void PhysicsUpdate(float delta);
 }

Engine.Physics2D/Abstract/Updates/IPostPhysicsUpdate.cs

@@ -10,6 +10,6 @@ public interface IPostPhysicsUpdate : IBehaviour
     /// <summary>
     /// Execute logic that should occur after the physics simulation has been updated.
     /// </summary>
-    /// <param name="delta">The time elapsed since the last physics update, typically in seconds.</param>
+    /// <param name="delta">The time elapsed since the last physics update.</param>
     void PostPhysicsUpdate(float delta);
 }

Engine.Physics2D/Abstract/Updates/IPrePhysicsUpdate.cs

@@ -10,6 +10,6 @@ public interface IPrePhysicsUpdate : IBehaviour
     /// <summary>
     /// Execute logic that should occur before the physics simulation is updated.
     /// </summary>
-    /// <param name="delta">The time elapsed since the last physics update, typically in seconds.</param>
+    /// <param name="delta">The time elapsed since the last physics update.</param>
     void PrePhysicsUpdate(float delta);
 }

Engine.Physics2D/PhysicsEngine2D.cs

@@ -187,6 +187,7 @@ public class PhysicsEngine2D : Behaviour, IPhysicsEngine2D
     {
         physicsPreUpdateCollector.Assign(universe);
         physicsUpdateCollector.Assign(universe);
+        physicsIterationCollector.Assign(universe);
         physicsPostUpdateCollector.Assign(universe);
         colliderCollector.Assign(universe);
         rigidBodyCollector.Assign(universe);
@@ -198,6 +199,7 @@ public class PhysicsEngine2D : Behaviour, IPhysicsEngine2D
     {
         physicsPreUpdateCollector.Unassign();
         physicsUpdateCollector.Unassign();
+        physicsIterationCollector.Unassign();
         physicsPostUpdateCollector.Unassign();
         colliderCollector.Unassign();
         rigidBodyCollector.Unassign();