Update cityIds for new example data set

Author: szarnyasg

cypher/queries/bi-19.cypher

@@ -1,7 +1,7 @@
 // Q19. Interaction path between cities
 // Requires the Neo4j Graph Data Science library
 /*
-:param [{ city1Id, city2Id }] => {RETURN 2 AS city1Id, 4 AS city2Id}
+:param [{ city1Id, city2Id }] => {RETURN 5 AS city1Id, 6 AS city2Id}
 */
 MATCH
   (person1:Person)-[:IS_LOCATED_IN]->(city1:City {id: $city1Id}),