Added note on NEXT limitations

Author: JoelBergstrand

modules/ROOT/pages/queries/composed-queries/sequential-queries.adoc

@@ -381,4 +381,8 @@ RETURN customer.firstName AS plantCustomer
 | "Niko"
 
 1+d|Rows: 6
-|===
+|===
+
+[[next-unsupported-behavior]]
+== Known limitations
+`NEXT` currently does not support aggregations when the aggregation is used in a `UNION` query, wrapped in braces or after a `USE` clause.