* remove doc from kubeadm-init.md which is duplicated in kubelet-integration.md
This section in reference/setup-tools/kubeadm/kubeadm-init.md seems to significantly overlap with setup/production-environment/tools/kubeadm/kubelet-integration.md - looks like someone copy/pasted it at some point? The information in kubelet-integration.md looks more up to date than this (e.g. there actually is no `--allow-privileged=true` or `--network-plugin=cni` here?). Therefore lets delete the sections content, and have a short line linking to the other one.
If this is accepted, then #15421 is moot (because #15423 moves it to the new place).
* shorten link re. removed doc from kubeadm-init.md
as requested in https://github.com/kubernetes/website/pull/15424/ review
* drop https://kubernetes.io from link in kubeadm-init.md
* Revert "shorten link re. removed doc from kubeadm-init.md"
This reverts commit f128ce7dc2.
* fix bad wording
* update kubeadm-init.md based on kbhawkey review feedback
* remove duplicate sentence in kubeadm-init.md
f21879772a