zh_Trans: Fix preview issue (#11311)

* zh_trans: kubeadm-upgrade-1-12.md

* update file

* Update _index.md

* Delete _index.md

* Update kubeadm-upgrade-1-12.md

* zh_trans: docs/reference/setup-tools/kubeadm/generated/kubeadm_config.md

* Update kubeadm_config.md

* zh_trans: fix Preview

* zh_trans: fix Preview

content/zh/examples/application/guestbook/frontend-deployment.yaml

@@ -0,0 +1,38 @@
+apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
+kind: Deployment
+metadata:
+  name: frontend
+  labels:
+    app: guestbook
+spec:
+  selector:
+    matchLabels:
+      app: guestbook
+      tier: frontend
+  replicas: 3
+  template:
+    metadata:
+      labels:
+        app: guestbook
+        tier: frontend
+    spec:
+      containers:
+      - name: php-redis
+        image: gcr.io/google-samples/gb-frontend:v4
+        resources:
+          requests:
+            cpu: 100m
+            memory: 100Mi
+        env:
+        - name: GET_HOSTS_FROM
+          value: dns
+          # Using `GET_HOSTS_FROM=dns` requires your cluster to
+          # provide a dns service. As of Kubernetes 1.3, DNS is a built-in
+          # service launched automatically. However, if the cluster you are using
+          # does not have a built-in DNS service, you can instead
+          # access an environment variable to find the master
+          # service's host. To do so, comment out the 'value: dns' line above, and
+          # uncomment the line below:
+          # value: env
+        ports:
+        - containerPort: 80