Automatic merge from submit-queue (batch tested with PRs 55764, 55683, 55468, 54409, 55546). 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>.
streamline kubeadm-doc-gen
**What this PR does / why we need it**:
this PR completes the work of #54616 by automating post processing for kubeadm automatically generate documentation.
Post processing is necessary to adapt generated documents on website conventions, and before this PR, was executed manually.
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
cc @kubernetes/sig-docs-maintainers @Bradamant3 @heckj @luxas
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