docs(shareReplay): rename variable in example (#4501)
docs(shareReplay): rename variable in example (#4501)

Closes #4428
Brocco/RxJS,ReactiveX/RxJS,benlesh/RxJS,ReactiveX/rxjs,Brocco/RxJS,trxcllnt/RxJS,benlesh/RxJS,ReactiveX/RxJS,benlesh/RxJS,trxcllnt/RxJS,martinsik/rxjs,trxcllnt/RxJS,kwonoj/RxJS,ReactiveX/RxJS,kwonoj/RxJS,Brocco/RxJS,ReactiveX/rxjs,ReactiveX/RxJS,benlesh/RxJS,kwonoj/RxJS,ReactiveX/rxjs,Brocco/RxJS,kwonoj/RxJS,martinsik/rxjs,trxcllnt/RxJS,martinsik/rxjs,ReactiveX/rxjs,martinsik/rxjs