Move kubeadm reference, add a navigation link to it and assignees

docs/admin/kubeadm.md

@@ -1,4 +1,11 @@
-# kubeadm reference
+---
+assignees:
+- mikedanese
+- luxas
+- errordeveloper
+
+---
+
 
 This document provides information on how to use kubeadm's advanced options.
 

docs/getting-started-guides/kubeadm.md

@@ -211,7 +211,7 @@ See the [list of add-ons](/docs/admin/addons/) to explore other add-ons, includi
 
 * Learn more about [Kubernetes concepts and kubectl in Kubernetes 101](/docs/user-guide/walkthrough/).
 * Install Kubernetes with [a cloud provider configurations](/docs/getting-started-guides/) to add Load Balancer and Persistent Volume support.
-* Learn about `kubeadm`'s advanced usage on the [advanced reference doc](/docs/user-guide/kubeadm-reference/)
+* Learn about `kubeadm`'s advanced usage on the [advanced reference doc](/docs/admin/kubeadm/)
 
 
 ## Cleanup