Update k8s201.md

Added example of using the exposed host from the a node running Kubernetes. (This works on AWS with Weave; not able to test it on other variations...)

docs/user-guide/walkthrough/k8s201.md

@@ -152,6 +152,14 @@ $ kubectl delete pod busybox # Clean up the pod we created with "kubectl run"
 {% endraw %}
 ```
 
+The service definition [exposed the Nginx Service](/docs/tasks/inject-data-application/downward-api-volume-expose-pod-information/) as port 8000 (`$SERVCE_PORT`). We can also access the service from a host running Kubernetes using that port:
+
+```shell
+wget -qO- http://$SERVICE_IP:$SERVICE_PORT # Run on a Kubernetes host
+```
+
+(This works on AWS with Weave.)
+
 To delete the service by name:
 
 ```shell