Changelog ToC cluttered with subtitles

[pedro-psb]

problem: As a user of changelog, I usually want to inspect a specific or set of versions and I expect to use the ToC to only navigate through the releases. The additional titles (RESTAPI > Bugfixes, etc) in the ToC get in the way of navigating through the versions.

expectation: What I would expect is that they are hidden from the ToC so I it shows only the release versions. Of course, they still show in the changelog itself.