Removing namespace when creating srv/sample-app

contrib/kube-prometheus/experimental/custom-metrics-api/README.md

@@ -14,7 +14,7 @@ When you're done, you can teardown using the `./teardown.sh` script.
 
 Additionally, this directory contains a sample app that uses the [Horizontal Pod Autoscaler](https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale/) to scale the Deployment's replicas of Pods up and down as needed.  
 Deploy this app by running `kubectl apply -f sample-app.yaml`. 
-Make the app accessible on your system, for example by using `kubectl -n monitoring port-forward svc/sample-app 8080`. Next you need to put some load on its http endpoints. 
+Make the app accessible on your system, for example by using `kubectl port-forward svc/sample-app 8080`. Next you need to put some load on its http endpoints. 
 
 A tool like [hey](https://github.com/rakyll/hey) is helpful for doing so: `hey -c 20 -n 100000000 http://localhost:8080/metrics`