Mention why kubeadm is updated

docs/vmdriver-none.md

@@ -44,9 +44,9 @@ We'll cover these in detail below:
 
 With the `none` driver, minikube will overwrite the following system paths:
 
-* /usr/local/bin/kubeadm
-* /usr/local/bin/kubectl
-* /etc/kubernetes
+* /usr/local/bin/kubeadm - Updated to match the exact version of Kubernetes selected
+* /usr/local/bin/kubectl - Updated to match the exact version of Kubernetes selected
+* /etc/kubernetes - configuration files
 
 These paths will be erased when running `minikube delete`: