docs(toArray): create documentation for operator
docs(toArray): create documentation for operator

Add documentation for operator including marble diagram, reference to buffer and code example.

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