Exclude comments from specific docs

Achilleas Pipinellisrequested to merge
docs/no-comments into master

What does this MR do?

Exclude comments from docs that are not needed, make sure all first headings are H1.

What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/39678, part of https://gitlab.com/gitlab-org/gitlab-ce/issues/39677

Edited by Achilleas Pipinellis

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