Fixes runAsGroup security context example (#13535) (#13538)

content/en/docs/tasks/configure-pod-container/security-context.md

@@ -79,15 +79,15 @@ kubectl exec -it security-context-demo -- sh
 In your shell, list the running processes:
 
 ```shell
-ps aux
+ps
 ```
 
 The output shows that the processes are running as user 1000, which is the value of `runAsUser`:
 
 ```shell
-USER   PID %CPU %MEM    VSZ   RSS TTY   STAT START   TIME COMMAND
-1000     1  0.0  0.0   4336   724 ?     Ss   18:16   0:00 /bin/sh -c node server.js
-1000     5  0.2  0.6 772124 22768 ?     Sl   18:16   0:00 node server.js
+PID   USER     TIME  COMMAND
+    1 1000      0:00 sleep 1h
+    6 1000      0:00 sh
 ...
 ```
 

content/en/examples/pods/security/security-context.yaml

@@ -5,13 +5,15 @@ metadata:
 spec:
   securityContext:
     runAsUser: 1000
+    runAsGroup: 3000
     fsGroup: 2000
   volumes:
   - name: sec-ctx-vol
     emptyDir: {}
   containers:
   - name: sec-ctx-demo
-    image: gcr.io/google-samples/node-hello:1.0
+    image: busybox
+    command: [ "sh", "-c", "sleep 1h" ]
     volumeMounts:
     - name: sec-ctx-vol
       mountPath: /data/demo