Clarify that you have to list system primaries in your endpoints (#2057)

This PR is related to
#2016.

Author: NataliaIvakina

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

@@ -14,7 +14,7 @@ Neo4j provides several mechanisms for cluster members to discover each other and
 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.
+Details are provided in link:https://neo4j.com/docs/operations-manual/5/clustering/setup/discovery/#clustering-discovery-v1-to-v2[the guide for the Neo4j 5.x series].
 ====
 
 [[clustering-discovery-methods]]
@@ -23,6 +23,11 @@ See link:https://neo4j.com/docs/operations-manual/5/clustering/setup/discovery/[
 Depending on the type of xref:configuration/configuration-settings.adoc#config_dbms.cluster.discovery.resolver_type[`dbms.cluster.discovery.resolver_type`] currently in use, the discovery service can use a list of server addresses, DNS records, or Kubernetes services to discover other servers in the cluster.
 The discovery configuration is used for initial discovery and to continuously exchange information about changes to the topology of the cluster.
 
+[NOTE]
+====
+Regardless of the method used to resolve the list of server addresses, ensure that the endpoint for each server hosting the `system` database in primary mode is included.
+====
+
 [[clustering-discovery-list]]
 === Discovery using a list of server addresses