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Documentation does not show when a feature was added
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On the downloads page there's a documentation zip file included in the list of available files. So if you want to have the documentation from a specific release you can go back and grab that file for the release you're using.

Of course... there doesn't seem to be a quick link to that, so you'd have to alter the url and rely on consistent naming, which isn't the optimal solution, but hey.

Looke like https://www.sqlite.org/<year of release>/sqlite-doc-<version number>.zip

There's probably a way to do it with fossil, but I'm not familiar with that.