Merge release 1.14 into 1.15. (#16439)

1. Confirm the document content is similar as en version.
2. Merge the zh release-1.14 version into 1.15 version
3. add the 1.14 all sample into 1.15 for template work. The build looks fine.

- docs
  - concepts
    - architecture

content/zh/examples/pods/init-containers.yaml

@@ -0,0 +1,30 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: init-demo
+spec:
+  containers:
+  - name: nginx
+    image: nginx
+    ports:
+    - containerPort: 80
+    volumeMounts:
+    - name: workdir
+      mountPath: /usr/share/nginx/html
+  # These containers are run during pod initialization
+  initContainers:
+  - name: install
+    image: busybox
+    command:
+    - wget
+    - "-O"
+    - "/work-dir/index.html"
+    - http://kubernetes.io
+    volumeMounts:
+    - name: workdir
+      mountPath: "/work-dir"
+  dnsPolicy: Default
+  volumes:
+  - name: workdir
+    emptyDir: {}
+