Define environment variable container style (#8743)

* define-environment-variable-container format

* run-stateless-application-deployment format

content/en/docs/tasks/inject-data-application/define-environment-variable-container.md

@@ -36,11 +36,11 @@ Pod:
 
 1. Create a Pod based on the YAML configuration file:
 
-       kubectl create -f https://k8s.io/docs/tasks/inject-data-application/envars.yaml
+        kubectl create -f https://k8s.io/docs/tasks/inject-data-application/envars.yaml
 
 1. List the running Pods:
 
-       kubectl get pods -l purpose=demonstrate-envars
+        kubectl get pods -l purpose=demonstrate-envars
 
     The output is similar to this:
 
@@ -49,11 +49,11 @@ Pod:
 
 1. Get a shell to the container running in your Pod:
 
-       kubectl exec -it envar-demo -- /bin/bash
+        kubectl exec -it envar-demo -- /bin/bash
 
 1. In your shell, run the `printenv` command to list the environment variables.
 
-       root@envar-demo:/# printenv
+        root@envar-demo:/# printenv
 
     The output is similar to this: