Merge branch 'master' of https://github.com/kubernetes/kubernetes.github.io into release-1.8

* 'master' of https://github.com/kubernetes/kubernetes.github.io:
  Update photon-controller.md (#5279)
  add back Zach and Steve to PR assignment
  fix the command output
  Update troubleshooting.md
  Update guaranteed-scheduling-critical-addon-pods.md
  Include filename fix (#5139)
  k8s-tutorials-stateful-application (#5112)
  Update gce.md (#5163)
  Update stage-documentation-changes.md (#5213)
  fix the command output
  Fix token-authentication-file internal link

docs/tasks/access-application-cluster/create-external-load-balancer.md

@@ -82,16 +82,19 @@ kubectl describe services example-service
 which should produce output like this:
 
 ```bash
-    Name:  example-service
-    Selector:   app=example
-    Type:     LoadBalancer
-    IP:     10.67.252.103
-    LoadBalancer Ingress: 123.45.678.9
-    Port:     <unnamed> 80/TCP
-    NodePort:   <unnamed> 32445/TCP
-    Endpoints:    10.64.0.4:80,10.64.1.5:80,10.64.2.4:80
-    Session Affinity: None
-    No events.
+    Name:                   example-service
+    Namespace:              default
+    Labels:                 <none>
+    Annotations:            <none>
+    Selector:               app=example
+    Type:                   LoadBalancer
+    IP:                     10.67.252.103
+    LoadBalancer Ingress:   123.45.678.9
+    Port:                   <unnamed> 80/TCP
+    NodePort:               <unnamed> 32445/TCP
+    Endpoints:              10.64.0.4:80,10.64.1.5:80,10.64.2.4:80
+    Session Affinity:       None
+    Events:                 <none>
 ```
 
 The IP address is listed next to `LoadBalancer Ingress`.

docs/tasks/administer-cluster/guaranteed-scheduling-critical-addon-pods.md

@@ -49,6 +49,7 @@ It doesn't have any user facing configuration (component config) or API and can
 ### Marking add-on as critical
 
 To be critical an add-on has to run in `kube-system` namespace (configurable via flag) and
+
 * have the `scheduler.alpha.kubernetes.io/critical-pod` annotation set to empty string, and
 * have the PodSpec's `tolerations` field set to `[{"key":"CriticalAddonsOnly", "operator":"Exists"}]`