Kubeadm /docs/admin/kubeadm.md cleanup, editing.#5681

Merged

steveperry-53 merged 2 commits intokubernetes:release-1.8from mattmoyer:release-1.8-kubeadm-updates

Sep 29, 2017

+210-81

Commits on Sep 28, 2017

Update docs/admin/kubeadm.md (mostly 1.8 related).

fabriziopandini
authored and
mattmoyer
committed
A few of my own edits to clarify and clean up some Markdown.
mattmoyer
committed