fixup! Support multiple properties in select id generator

Fix obsolete message

Author: fredericDelaporte

src/NHibernate/Id/IPostInsertIdentityPersister.cs

@@ -105,7 +105,7 @@ public interface IPostInsertIdentityPersister
 		/// </param>
 		/// <returns> The SQL select string </returns>
 		// Since 5.2
-		[Obsolete("Have the persister implement IMultiPropertiesPostInsertIdentityPersister and use its GetSelectByUniqueKeyString(string[] suppliedPropertyNames, out IType[] parameterTypes).")]
+		[Obsolete("Have the persister implement ICompositeKeyPostInsertIdentityPersister and use its GetSelectByUniqueKeyString(string[] suppliedPropertyNames, out IType[] parameterTypes).")]
 		SqlString GetSelectByUniqueKeyString(string propertyName);
 
 		#region NH specific