Add codenew shortcode to configure-pod-configmap task file and sanitize the example files (#13078)

content/en/examples/pods/pod-configmap-volume-specific-key.yaml

@@ -0,0 +1,20 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: dapi-test-pod
+spec:
+  containers:
+    - name: test-container
+      image: k8s.gcr.io/busybox
+      command: [ "/bin/sh","-c","cat /etc/config/keys" ]
+      volumeMounts:
+      - name: config-volume
+        mountPath: /etc/config
+  volumes:
+    - name: config-volume
+      configMap:
+        name: special-config
+        items:
+        - key: special.level
+          path: keys
+  restartPolicy: Never