Update the intro page for 5.x series (#2073)

Author: NataliaIvakina

modules/ROOT/pages/index.adoc

@@ -11,6 +11,8 @@
 
 This is the Neo4j Operations Manual, which includes all the operational details and instructions for installing and deploying Neo4j in a self-hosted environment or in the cloud.
 
+The manual covers the series of Neo4j 5, including the long-term support release *5.26*.
+
 [NOTE]
 ====
 For all information on *upgrading and migrating Neo4j*, see link:{upgrade-current-uri}[the Neo4j Upgrade and Migration Guide].
@@ -19,9 +21,7 @@ For all information on *upgrading and migrating Neo4j*, see link:{upgrade-curren
 For more information, see the link:https://neo4j.com/aura/[AuraDB product page] and link:https://neo4j.com/docs/aura/current/[AuraDB documentation].
 ====
 
-The latest version of Neo4j is *{neo4j-version-minor}*.
-
-== Documentation updates for Neo4j 5
+== Documentation updates for Neo4j 5.x
 
 * Restructured chapter on clustering.
 +