Update changelog

Author: noellie-velez

com.unity.netcode.gameobjects/CHANGELOG.md

@@ -22,7 +22,7 @@ Additional documentation and release notes are available at [Multiplayer Documen
 - Removed un-needed exceptions on `NetworkObject.cs`. (#3867)
 
 ### Fixed
-
+- Fixed `NetworkShow` behavior when it is called twice. (#3867) 
 
 ### Security