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/inject/dapi-envars-pod.yaml

@@ -0,0 +1,38 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: dapi-envars-fieldref
+spec:
+  containers:
+    - name: test-container
+      image: k8s.gcr.io/busybox
+      command: [ "sh", "-c"]
+      args:
+      - while true; do
+          echo -en '\n';
+          printenv MY_NODE_NAME MY_POD_NAME MY_POD_NAMESPACE;
+          printenv MY_POD_IP MY_POD_SERVICE_ACCOUNT;
+          sleep 10;
+        done;
+      env:
+        - name: MY_NODE_NAME
+          valueFrom:
+            fieldRef:
+              fieldPath: spec.nodeName
+        - name: MY_POD_NAME
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.name
+        - name: MY_POD_NAMESPACE
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.namespace
+        - name: MY_POD_IP
+          valueFrom:
+            fieldRef:
+              fieldPath: status.podIP
+        - name: MY_POD_SERVICE_ACCOUNT
+          valueFrom:
+            fieldRef:
+              fieldPath: spec.serviceAccountName
+  restartPolicy: Never