C comment:  correct heading of extension query
Reported-by: Justin Pryzby
Discussion:
Backpatch-through: 9.6
@@ -495,7 +495,7 @@ report_extension_updates(ClusterInfo *cluster)
DbInfo *active_db = &cluster->dbarr.dbs[dbnum];
PGconn *conn = connectToServer(cluster, active_db->db_name);
- /* find hash indexes */
+ /* find extensions needing updates */
res = executeQueryOrDie(conn,
"SELECT name "
"FROM pg_available_extensions "
