2.x: Describe merge() error handling. (#5781)
2.x: Describe merge() error handling. (#5781)


ReactiveX/RxJava,NiteshKant/RxJava,ReactiveX/RxJava,akarnokd/RxJava,artem-zinnatullin/RxJava,reactivex/rxjava,artem-zinnatullin/RxJava,NiteshKant/RxJava,akarnokd/RxJava,reactivex/rxjava