fix markdown format as shell

Author: DanteMustCode

content/en/docs/tutorials/stateful-application/basic-stateful-set.md

@@ -254,8 +254,8 @@ web-0
 web-1
 ```
 then, run:
-```
-kubectl run -i --tty --image busybox:1.28 dns-test --restart=Never --rm /bin/sh
+```shell
+kubectl run -i --tty --image busybox:1.28 dns-test --restart=Never --rm
 ```
 which starts a new shell.  
 In that new shell, run:
@@ -1257,4 +1257,4 @@ You also need to delete the persistent storage media for the PersistentVolumes
 used in this tutorial.
 Follow the necessary steps, based on your environment, storage configuration,
 and provisioning method, to ensure that all storage is reclaimed.
-{{< /note >}}
+{{< /note >}}