Add a note to stress the importance of moving to lighthouse before 2025.01

Author: NataliaIvakina

modules/ROOT/pages/clustering/setup/discovery.adoc

@@ -9,6 +9,14 @@ This information is necessary to connect to the servers, run the discovery proto
 
 Neo4j provides several mechanisms for cluster members to discover each other and form a cluster based on the configuration and the environment in which the cluster is running, as well as the version of Neo4j being used.
 
+[IMPORTANT]
+====
+In Neo4j 5.23, a new discovery service was introduced.
+You must move to the new version before you start using Neo4j 2025.01.
+
+See link:https://neo4j.com/docs/operations-manual/5/clustering/setup/discovery/[the guide for the Neo4j 5.x series] for more information.
+====
+
 [[clustering-discovery-methods]]
 == Methods for server discovery