Improvements for markdown formatting (#12193)

* Fixed markdown formatting

* Resolved usage of 'shell' instead of 'yaml'

* Removed unknown 'log' keyword

content/en/docs/tasks/inject-data-application/define-command-argument-container.md

@@ -46,11 +46,15 @@ file for the Pod defines a command and two arguments:
 
 1. Create a Pod based on the YAML configuration file:
 
-        kubectl create -f https://k8s.io/examples/pods/commands.yaml
+    ```shell
+    kubectl create -f https://k8s.io/examples/pods/commands.yaml
+    ```
 
 1. List the running Pods:
 
-        kubectl get pods
+    ```shell
+    kubectl get pods
+    ```
 
     The output shows that the container that ran in the command-demo Pod has
     completed.
@@ -58,13 +62,17 @@ file for the Pod defines a command and two arguments:
 1. To see the output of the command that ran in the container, view the logs
 from the Pod:
 
-        kubectl logs command-demo
+    ```shell
+    kubectl logs command-demo
+    ```
 
     The output shows the values of the HOSTNAME and KUBERNETES_PORT environment
     variables:
 
-        command-demo
-        tcp://10.3.240.1:443
+    ```
+    command-demo
+    tcp://10.3.240.1:443
+    ```
 
 ## Use environment variables to define arguments
 
@@ -72,11 +80,13 @@ In the preceding example, you defined the arguments directly by
 providing strings. As an alternative to providing strings directly,
 you can define arguments by using environment variables:
 
-    env:
-    - name: MESSAGE
-      value: "hello world"
-    command: ["/bin/echo"]
-    args: ["$(MESSAGE)"]
+```yaml
+env:
+- name: MESSAGE
+  value: "hello world"
+command: ["/bin/echo"]
+args: ["$(MESSAGE)"]
+```
 
 This means you can define an argument for a Pod using any of
 the techniques available for defining environment variables, including
@@ -95,8 +105,10 @@ In some cases, you need your command to run in a shell. For example, your
 command might consist of several commands piped together, or it might be a shell
 script. To run your command in a shell, wrap it like this:
 
-    command: ["/bin/sh"]
-    args: ["-c", "while true; do echo hello; sleep 10;done"]
+```shell
+command: ["/bin/sh"]
+args: ["-c", "while true; do echo hello; sleep 10;done"]
+```
 
 ## Notes