SEBA-785: remove unsupported services from guide contents

Change-Id: I0020be2b101e311c4b25cc1f5f339647821aa293
diff --git a/SUMMARY.md b/SUMMARY.md
index cf828b6..6429f19 100644
--- a/SUMMARY.md
+++ b/SUMMARY.md
@@ -109,9 +109,7 @@
     * [vRouter](vrouter/README.md)
     * [AT&T Workflow Driver](att-workflow-driver/README.md)
     * [Kubernetes](kubernetes-service/kubernetes-service.md)
-    * [OpenStack](openstack/openstack-service.md)
     * [SimpleExampleService](simpleexampleservice/simple-example-service.md)
-    * [VTN](vtn-service/README.md)
 * [Helm Reference](charts/helm.md)
     * [Base Kubernetes](charts/base-kubernetes.md)
     * [Base OpenStack](charts/base-openstack.md)