[en] config-pod-configmap add cleanup step.

Remove special-config before next step to create newer with different data.

Fix quotation mark of cleanup command.

Fix quotation mark in create a configmap section.

Add commands to remove used files.

Remove unnecessary files and directories

Fix nits

Apply suggestions from code review

Co-authored-by: Charles Uneze <charlesniklaus@gmail.com>

content/en/docs/tasks/configure-pod-container/configure-pod-configmap.md

@@ -582,9 +582,11 @@ Here is the manifest you will use:
 
   Now, the Pod's output includes environment variables `SPECIAL_LEVEL_KEY=very` and `LOG_LEVEL=INFO`.
 
-  Once you're happy to move on, delete that Pod:
+  Once you're happy to move on, delete that Pod and ConfigMap:
   ```shell
   kubectl delete pod dapi-test-pod --now
+  kubectl delete configmap special-config
+  kubectl delete configmap env-config
   ```
 
 ## Configure all key-value pairs in a ConfigMap as container environment variables
@@ -913,9 +915,19 @@ kubectl delete configmaps/special-config configmaps/env-config
 kubectl delete configmap -l 'game-config in (config-4,config-5)'
 ```
 
+Remove the `kustomization.yaml` file that you used to generate the ConfigMap:
+
+```bash
+rm kustomization.yaml
+```
+
 If you created a directory `configure-pod-container` and no longer need it, you should remove that too,
 or move it into the trash can / deleted files location.
 
+```bash
+rm -r configure-pod-container
+```
+
 ## {{% heading "whatsnext" %}}
 
 * Follow a real world example of