Explain how to cleanup the created pod (#15698)

* Explain how to cleanup the created pod

I'm still learning. Feel free to provide a better example.

* Update configure-redis-using-configmap.md

content/en/docs/tutorials/configuration/configure-redis-using-configmap.md

@@ -99,6 +99,11 @@ kubectl exec -it redis redis-cli
 2) "allkeys-lru"
 ```
 
+Delete the created pod:
+```shell
+kubectl delete pod redis
+```
+
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