Update aws.md
Update aws.md

I had an issue with DNS not working because i didn't add the "kubernetes.io/cluster/$cluster_name" to the route table my subnets where using.
kubernetes-sigs/kubespray,kubernetes-sigs/kubespray,kubernetes-incubator/kargo,insequent/kargo,kubernetes-incubator/kubespray,Atoms/kubespray,kubespray/kargo,kubernetes-incubator/kubespray,kubernetes-sigs/kubespray,Atoms/kubespray,kubespray/kargo,Atoms/kubespray,Atoms/kubespray,kubernetes-sigs/kubespray,insequent/kargo,kubernetes-incubator/kargo