add single.toObservable operator to docs
add single.toObservable operator to docs

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