Add alias for index page (#1029)

Author: JPryce-Aklundh

modules/ROOT/pages/indexes/search-performance-indexes/using-indexes.adoc

@@ -1,6 +1,7 @@
 :description: Information about how search-performance indexes impact query performance in Neo4j.
 :test-setup-dump: https://github.com/neo4j-graph-examples/openstreetmap/raw/main/data/openstreetmap-50.dump
 include::https://raw.githubusercontent.com/neo4j-graphacademy/courses/main/asciidoc/courses/cypher-indexes-constraints/ad.adoc[]
+:page-aliases: query-tuning/indexes.adoc
 
 = The impact of indexes on query performance
 
@@ -260,7 +261,7 @@ MERGE (:PointOfInterest {name:varName.name})
 [source,cypher]
 ----
 WITH {name: 'William Shakespeare'} AS varName
-MERGE (ws:PointOfInterest {name: toString(varName.name)})
+MERGE (:PointOfInterest {name: toString(varName.name)})
 ----
 
 For information about how to ensure the use of text indexes when predicates may contain `null` values, see xref:indexes/search-performance-indexes/using-indexes/indexes-and-null[Indexes and `null` values].