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Automatic merge from submit-queue (batch tested with PRs 51409, 54616). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Generate kubeadm referencedoc and man pages **What this PR does / why we need it**: Improve kubeadm reference doc and start generating kubeadm man pages. With this PR, also kubeadm will start following the same approach used by other tools **Which issue this PR fixes** initial work for [#265](https://github.com/kubernetes/kubeadm/issues/265) **Special notes for your reviewer**: This [document](https://docs.google.com/document/d/1w22y-C1YD1mmqqETxrQrCLnJpzwttscanddgvfYceYY/edit?usp=sharing) contains the design proposal for how to implement this goal, that will be implemented partially in https://github.com/kubernetes/kubernetes (this PR) and partially in https://github.com/kubernetes/website In order to keep the PR as small and clean possible I didn't generated new placeholders files under `/docs/man` and `/docs/admin` at this stage. If this is necessary, I will do this later in this PR or eventually in another PR; however, if this is not strictly necessary, IMO we should avoid to pollute this repo with placeholders to file that are maintained in another repo. cc @kubernetes/sig-docs-maintainers @Bradamant3 @heckj