Heading level skips (e.g. H2 to H4 without H3) WAI/WCAG violations

https://www.w3.org/WAI/tutorials/page-structure/headings/

> Skipping heading ranks can be confusing and should be avoided where possible: Make sure that a \ is not followed directly by an \, for example. It is ok to skip ranks when closing subsections, for instance, a \ beginning a new section, can follow an \ as it closes the previous section.

Asked my 🤖 buddy Claude to sweep for them after manually finding #824

Start by reading the linked WAI heading guidance, then sweep the documentation for heading-rank transitions such as H2 directly to H4. Review each reported occurrence in context, preserving valid skips when closing subsections. Done means the documented pages no longer contain avoidable heading-level skips.

Written by the indexing model from the issue text.