Make the command work with multiple pods too

if the user has 2 or more pods the original command line give the following error:
```error: only one of -c or an inline [CONTAINER] arg is allowed
See 'kubectl logs -h' for help and examples.```

Author: mastrolinux

content/en/docs/tasks/administer-cluster/dns-debugging-resolution.md

@@ -110,9 +110,9 @@ have to deploy it manually.
 Use `kubectl logs` command to see logs for the DNS daemons.
 
 ```shell
-$ kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name) -c kubedns
-$ kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name) -c dnsmasq
-$ kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name) -c sidecar
+$ kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name | head -1) -c kubedns
+$ kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name | head -1) -c dnsmasq
+$ kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name | head -1) -c sidecar
 ```
 
 See if there is any suspicious log. Letter '`W`', '`E`', '`F`' at the beginning