docs(concatAll): fix map import (#4535)
docs(concatAll): fix map import (#4535)


Brocco/RxJS,Brocco/RxJS,martinsik/rxjs,kwonoj/RxJS,ReactiveX/RxJS,ReactiveX/rxjs,ReactiveX/RxJS,benlesh/RxJS,martinsik/rxjs,trxcllnt/RxJS,trxcllnt/RxJS,martinsik/rxjs,trxcllnt/RxJS,kwonoj/RxJS,kwonoj/RxJS,benlesh/RxJS,ReactiveX/rxjs,ReactiveX/rxjs,ReactiveX/rxjs,Brocco/RxJS,kwonoj/RxJS,ReactiveX/RxJS,trxcllnt/RxJS,martinsik/rxjs,Brocco/RxJS,ReactiveX/RxJS,benlesh/RxJS,benlesh/RxJS