update incorrect URL

Author: MarkWoulfeNeo4j

docs/modules/ROOT/pages/index.adoc

@@ -50,5 +50,5 @@ _Who should read this?_
 
 This manual is written for developers, database administrators, quality engineers, data scientists, and data architects, who may or may not be familiar with Neo4j.
 
-// Edit at: https://github.com/neo4j-graphacademy/courses/blob/main/asciidoc/courses/neo4j-fundamentals/promo.adoc
-include::https://raw.githubusercontent.com/neo4j-graphacademy/courses/main/asciidoc/courses/neo4j-fundamentals/promo.adoc[]
+// Edit at: https://github.com/neo4j-graphacademy/courses/blob/main/asciidoc/courses/cypher-fundamentals/promo.adoc
+include::https://raw.githubusercontent.com/neo4j-graphacademy/courses/main/asciidoc/courses/cypher-fundamentals/promo.adoc[]