Currently, instance chains aren’t documented any differently from a collection of normal (non-chained) instances: https://pursuit.purescript.org/packages/purescript-either/4.1.1/docs/Data.Either.Inject

I think this could be improved. Ideally it would look somewhat similar to what you see in the source file, while also being consistent with the look and feel of HTML documentation. I don’t have a concrete proposal yet; suggestions welcome.