Add PR number to CHANGELOG entries

Author: simon-lemay-unity

com.unity.netcode.gameobjects/CHANGELOG.md

@@ -13,12 +13,13 @@ Additional documentation and release notes are available at [Multiplayer Documen
 
 ### Fixed
 
-- Fixed an issue where `UnityTransport` would not accept single words as valid hostnames (notably "localhost").
+- Fixed an issue where `UnityTransport` would not accept single words as valid hostnames (notably "localhost"). (#3591)
 - Fixed issue where viewing a `NetworkBehaviour` with one or more `NetworkVariable` fields could throw an exception if running a distributed authority network topology with a local (DAHost) host and viewed on the host when the host is not the authority of the associated `NetworkObject`. (#3578)
 - Fixed issue when using a distributed authority network topology and  viewing a `NetworkBehaviour` with one or more `NetworkVariable` fields in the inspector view would not show editable fields. (#3578)
 
 ### Changed
 
+- Marked `UnityTransport.ConnectionAddressData.ServerEndPoint` as obsolete. It can't work when using hostnames as the server address, and its functionality can easily be replicated using `NetworkEndpoint.Parse`. (#3591)
 
 ## [2.5.0] - 2025-08-01