docs(operators): Add interval to import (#4924)
docs(operators): Add interval to import (#4924)

Fixed import in example
benlesh/RxJS,kwonoj/RxJS,martinsik/rxjs,ReactiveX/rxjs,kwonoj/RxJS,trxcllnt/RxJS,benlesh/RxJS,ReactiveX/RxJS,kwonoj/RxJS,trxcllnt/RxJS,martinsik/rxjs,ReactiveX/rxjs,trxcllnt/RxJS,ReactiveX/RxJS,ReactiveX/RxJS,ReactiveX/rxjs,kwonoj/RxJS,benlesh/RxJS,benlesh/RxJS,martinsik/rxjs,trxcllnt/RxJS,ReactiveX/rxjs,ReactiveX/RxJS,martinsik/rxjs