Update kubelet-config-file.md

trying to fit it to yaml style, while making it work on my system required quite a change. I'm not sure if this is appropriate to change it so much.

content/en/docs/tasks/administer-cluster/kubelet-config-file.md

@@ -28,6 +28,13 @@ in this struct. Make sure the Kubelet has read permissions on the file.
 
 Here is an example of what this file might look like:
 ```
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: kubelet-config-1.20
+  namespace: kube-system
+data:
+  kubelet: |
     apiVersion: kubelet.config.k8s.io/v1beta1
     kind: KubeletConfiguration
     address: "192.168.0.8"
@@ -35,6 +42,8 @@ port: 20250
     serializeImagePulls: false
     evictionHard:
       memory.available:  "200Mi"
+~                                  
+
 ```
 
 In the example, the Kubelet is configured to serve on IP address 192.168.0.8 and port 20250, pull images in parallel,