Link `<h3>` headings in generated documentation

[kevinlitchfield]

Currently, only <h2> headings are linked in generated documentation (see ExDoc.Formatter.HTML.Templates.link_headings/3). It would be useful to be able to link to <h3> headings as well (for example, "Term ordering" under "Comparison operators" in the Elixir docs).

Would the maintainers consider a PR making this change?

[josevalim]

Yes, that does sound like a reasonable change assuming it won't introduce a lot of code to the codebase.

[kevinlitchfield]

Cool, thanks. Will give it a go.

[josevalim]

@kevinlitchfield if you ever get to this, please let us know! For now we are closing the issue. Thank you!