[ko] updated deprecated sample code on service

Author: Arhell

content/ko/docs/concepts/services-networking/service.md

@@ -720,7 +720,7 @@ metadata:
 metadata:
     name: my-service
     annotations:
-        service.beta.kubernetes.io/aws-load-balancer-internal: "true"
+        service.beta.kubernetes.io/aws-load-balancer-scheme: "internal"
 [...]
 ```