Tidy style & docs in catchError (#4553)
Tidy style & docs in catchError (#4553)

* style(catchError): tidy imports

* docs(catchError): tidy code style in examples

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