fix: Update API docs for MaxPayloadSize (#2877)

* Update API docs for MaxPayloadSize

* Update to API remark following review

com.unity.netcode.gameobjects/Runtime/Transports/UTP/UnityTransport.cs

@@ -202,11 +202,12 @@ namespace Unity.Netcode.Transports.UTP
             set => m_MaxPacketQueueSize = value;
         }
 
-        [Tooltip("The maximum size of an unreliable payload that can be handled by the transport.")]
+        [Tooltip("The maximum size of an unreliable payload that can be handled by the transport. The memory for MaxPayloadSize is allocated once per connection and is released when the connection is closed.")]
         [SerializeField]
         private int m_MaxPayloadSize = InitialMaxPayloadSize;
 
         /// <summary>The maximum size of an unreliable payload that can be handled by the transport.</summary>
+        /// <remarks>The memory for MaxPayloadSize is allocated once per connection and is released when the connection is closed.</remarks>
         public int MaxPayloadSize
         {
             get => m_MaxPayloadSize;