add explicit titles to docs

docs/tutorials/stateless-application/expose-external-ip-address-service.md

@@ -1,4 +1,5 @@
 ---
+title: Using a Service to Access an Application in a Cluster
 ---
 
 {% capture overview %}

docs/tutorials/stateless-application/expose-external-ip-address.md

@@ -1,4 +1,5 @@
 ---
+title: Exposing an External IP Address to Access an Application in a Cluster
 ---
 
 {% capture overview %}

docs/tutorials/stateless-application/run-stateless-application-deployment.md

@@ -1,4 +1,5 @@
 ---
+title: Running a Stateless Application Using a Deployment
 ---
 
 {% capture overview %}