docs(share): fix description in relation to multicast
docs(share): fix description in relation to multicast

PR #2990 

As suggested by https://github.com/ReactiveX/rxjs/issues/2937 this updates the docs on the share operator to better reflect it's actual behaviour.
ReactiveX/RxJS,jayphelps/rxjs,martinsik/rxjs,jayphelps/rxjs,ReactiveX/rxjs,kwonoj/RxJS,Brocco/RxJS,ReactiveX/RxJS,ReactiveX/rxjs,kwonoj/RxJS,Brocco/RxJS,IgorMinar/RxJS,Brocco/RxJS,martinsik/rxjs,jayphelps/rxjs,martinsik/rxjs,trxcllnt/RxJS,benlesh/RxJS,Brocco/RxJS,jayphelps/rxjs,martinsik/rxjs,trxcllnt/RxJS,IgorMinar/RxJS,ReactiveX/rxjs,kwonoj/RxJS,jayphelps/rxjs,benlesh/RxJS,trxcllnt/RxJS,ReactiveX/RxJS,benlesh/RxJS,trxcllnt/RxJS,benlesh/RxJS,kwonoj/RxJS,ReactiveX/rxjs,ReactiveX/RxJS