add forgotten test fail roles

Author: JPryce-Aklundh

modules/ROOT/pages/constraints/managing-constraints.adoc

@@ -1096,7 +1096,7 @@ Creating a constraint on the same label or relationship type and properties that
 ======
 
 .Create a constraint requiring all `SEQUEL_OF` relationships to have unique `order` properties, given an identical constraint already exists
-[source, cypher]
+[source, cypher, role=test-fail]
 ----
 CREATE CONSTRAINT sequels
 FOR ()-[sequel:SEQUEL_OF]-() REQUIRE sequel.order IS UNIQUE
@@ -1139,7 +1139,7 @@ The constraint type will be updated to say `NODE PROPERTY UNIQUENESS` in a futur
 ======
 
 .Create a constraint requiring all `AUTHORED` relationships to have unique `name` properties, given that a constraint on a different schema with the same name already exists
-[source, cypher]
+[source, cypher, role=test-fail]
 ----
 CREATE CONSTRAINT author_name
 FOR ()-[a:AUTHORED]-() REQUIRE a.name IS UNIQUE