Link to inner classes

[ennru]

The @apidoc directive does correctly link to inner classes.

@apidoc[DrainingControl](Consumer$DrainingControl) correctly identifies the classes akka.kafka.javadsl.Consumer.DrainingControl and akka.kafka.scaladsl.Consumer.DrainingControl, but the link to Scaladoc requires to use two $$:
https://doc.akka.io/api/alpakka-kafka/snapshot/akka/kafka/javadsl/Consumer$$DrainingControl.html