Update install-kubeadm.md

Add note to kubeadm install instruction to help install in other arch i.e. aarch64, ppc64le etc.

Author: Peeyush gupta

docs/setup/independent/install-kubeadm.md

@@ -190,7 +190,7 @@ apt-get install -y kubelet kubeadm kubectl
 cat <<EOF > /etc/yum.repos.d/kubernetes.repo
 [kubernetes]
 name=Kubernetes
-baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
+baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-$basearch
 enabled=1
 gpgcheck=1
 repo_gpgcheck=1