"Implemented types" contain weird repeated entries

[srawlins]

In the latest Dart API docs, on dev, I see three entries for Iterable on the List page.

https://api.dart.dev/dev/3.6.0-165.0.dev/dart-core/List-class.html

Looks like "Iterable<E>, Iterable<T>, Iterable<T>"

This is a recent regression I think. It could be due to f7e8def or to d629e1e.