Update content/en/docs/concepts/storage/volumes.md

"tail -f /dev/null " is better than "sleep 3600"

Co-authored-by: Tim Bannister <[email protected]>

Author: hchyue

content/en/docs/concepts/storage/volumes.md

@@ -174,7 +174,7 @@ spec:
   containers:
     - name: test
       image: busybox:1.28
-      command: ['sh', '-c', 'echo The app is running! && sleep 3600']
+      command: ['sh', '-c', 'echo "The app is running!" && tail -f /dev/null']
       volumeMounts:
         - name: config-vol
           mountPath: /etc/config