docs(migration): fix link to deprecated methods (#3695)
docs(migration): fix link to deprecated methods (#3695)

Fix broken page link to deprecated methods in migration guide
ReactiveX/RxJS,martinsik/rxjs,kwonoj/RxJS,kwonoj/RxJS,martinsik/rxjs,martinsik/rxjs,martinsik/rxjs,benlesh/RxJS,Brocco/RxJS,trxcllnt/RxJS,trxcllnt/RxJS,Brocco/RxJS,ReactiveX/rxjs,benlesh/RxJS,ReactiveX/RxJS,benlesh/RxJS,ReactiveX/rxjs,trxcllnt/RxJS,ReactiveX/RxJS,Brocco/RxJS,kwonoj/RxJS,ReactiveX/rxjs,trxcllnt/RxJS,ReactiveX/RxJS,ReactiveX/rxjs,benlesh/RxJS,kwonoj/RxJS,Brocco/RxJS