add xref

Author: JPryce-Aklundh

modules/ROOT/pages/introduction/index.adoc

@@ -18,7 +18,7 @@ As of Neo4j 2025.06, Cypher 5 is in a frozen state; no new features will be adde
 From Neo4j 2025.06 onward, all new Cypher features will be exclusively added to Cypher 25.
 For more details, see:
 
-* link:...[Select Cypher versions]
+* xref:queries/select-version.adoc[Select Cypher version]
 * link:https://neo4j.com/docs/cypher-manual/25/introduction/[Cypher 25 Manual]
 * link:https://neo4j.com/docs/cypher-manual/25/deprecations-additions-removals-compatibility/[Additions, deprecations, removals, and compatibility]
 ====