Clarify BI Q6 comments

Author: szarnyasg

cypher/queries/bi-6.cypher

@@ -4,11 +4,15 @@
 */
 MATCH (tag:Tag {name: $tag})<-[:HAS_TAG]-(message2:Message)-[:HAS_CREATOR]->(person1)
 OPTIONAL MATCH (message2)<-[:LIKES]-(person2:Person)
-OPTIONAL MATCH (person2)<-[:HAS_CREATOR]-(message3:Message)<-[like:LIKES]-(p3:Person)
+OPTIONAL MATCH (person2)<-[:HAS_CREATOR]-(message3:Message)<-[like:LIKES]-(person3:Person)
 RETURN
   person1.id,
-  count(DISTINCT like) AS authorityScore // 'DISTINCT like' ensures that each p2's popularity score is only added once for each p1
+  // Using 'DISTINCT like' here ensures that each person2's popularity score is only added once for each person1
+  count(DISTINCT like) AS authorityScore
 ORDER BY
   authorityScore DESC,
   person1.id ASC
 LIMIT 100
+
+// We need to use a redundant computation due to the lack of composable graph queries in the currently supported Cypher version.
+// This might change in the future with new Cypher versions and GQL.