Code style not working on kubernetes.io (#10727)

* Code style not working on kubernetes.io

Code style based on tab works on github markdown, but it is not working on kubernetes.io. In addition to that, `<your-pv-name>` argument on line 50 is hidden on kubernetes.io, because it is being processed as a HTML tag.

* Update change-pv-reclaim-policy.md

Indentation fix
Language of the code specified

content/en/docs/tasks/administer-cluster/change-pv-reclaim-policy.md

@@ -32,7 +32,9 @@ the corresponding `PersistentVolume` is not be deleted. Instead, it is moved to
 
 1. List the PersistentVolumes in your cluster:
 
-       kubectl get pv
+    ```shell
+    kubectl get pv
+    ```
 
     The output is similar to this:
 
@@ -46,13 +48,17 @@ the corresponding `PersistentVolume` is not be deleted. Instead, it is moved to
 
 1. Choose one of your PersistentVolumes and change its reclaim policy:
 
-       kubectl patch pv <your-pv-name> -p '{"spec":{"persistentVolumeReclaimPolicy":"Retain"}}'
+    ```shell
+    kubectl patch pv <your-pv-name> -p '{"spec":{"persistentVolumeReclaimPolicy":"Retain"}}'
+    ```
 
     where `<your-pv-name>` is the name of your chosen PersistentVolume.
 
 1. Verify that your chosen PersistentVolume has the right policy:
 
-       kubectl get pv
+    ```shell
+    kubectl get pv
+    ```
 
     The output is similar to this: