At Bitmovin we use Dokka, a tool for generating API documentation in Kotlin projects, because of its high flexibility and awesome features like top level module descriptions. And it seems like the Kotlin Team is also very happy with our Player Android API docs, as they mention us in a set of five API references using Dokka in their official Kotlin documentation.
Bitmovin loves Kotlin 
and it looks like Kotlin loves Bitmovin 
as well.