Update title of xref

Author: yetanothertw

deploy-manage/toc.yml

@@ -601,7 +601,7 @@ toc:
               - file: users-roles/cluster-or-deployment-auth/manage-authentication-for-multiple-clusters.md
           - file: users-roles/cluster-or-deployment-auth/user-roles.md
             children:
-              - title: "Roles"
+              - title: "Built-in roles"
                 crosslink: elasticsearch://reference/elasticsearch/roles.md
               - file: users-roles/cluster-or-deployment-auth/defining-roles.md
                 children: