Draft "Average" operator doc page with RxJava/RxGroovy and RxJS sections filled in
Draft "Average" operator doc page with RxJava/RxGroovy and RxJS sections filled in

ReactiveX/reactivex.github.io,BattleShipPark/reactivex.github.io,carlosypunto/reactivex.github.io,carlosypunto/reactivex.github.io,phajduk/reactivex.github.io,BattleShipPark/reactivex.github.io,zsxwing/reactivex.github.io,carlosypunto/reactivex.github.io,BattleShipPark/reactivex.github.io,ReactiveX/reactivex.github.io,zsxwing/reactivex.github.io,phajduk/reactivex.github.io,zsxwing/reactivex.github.io,phajduk/reactivex.github.io,ReactiveX/reactivex.github.io