Scala Caching Documentation Deprecated

It seems to me that the docs regarding Scala Cache is utterly deprecated. It talks about Future, but when I try, it returns CompletionStage.

Docs:
val futureMaybeUser: Future[Option[User]] = cache.getUser

What I see:
val user: CompletionStage[Optional[User]] = cache.getUser

/documentation/2.8.x/ScalaCache

Am I missing something?