docs(operators): write comprehensive JSDoc for count()
docs(operators): write comprehensive JSDoc for count()

elliotschi/rxjs,benlesh/RxJS,ReactiveX/rxjs,staltz/RxJSNext,IgorMinar/RxJS,Brocco/RxJS,robwormald/RxJS,figueredo/RxJS,Brocco/RxJS,adrianomelo/RxJSNext,ReactiveX/RxJS,adrianomelo/RxJSNext,SangKa/RxJS-Docs-CN,jayphelps/rxjs,jayphelps/rxjs,martinsik/rxjs,Brocco/RxJS,RxJS-CN/RxJS-Docs-CN,adrianomelo/RxJS-1,adrianomelo/RxJSNext,adrianomelo/RxJS-1,SangKa/RxJS-Docs-CN,ReactiveX/rxjs,ReactiveX/RxJS,kwonoj/RxJS,robwormald/RxJS,staltz/RxJSNext,gluck/RxJS,RxJS-CN/RxJS-Docs-CN,Igorbek/rxjs5,robwormald/RxJS,trxcllnt/RxJS,trxcllnt/RxJS,RxJS-CN/RxJS-Docs-CN,trxcllnt/RxJS,figueredo/RxJS,benlesh/RxJS,ReactiveX/RxJS,elliotschi/rxjs,Igorbek/rxjs5,gluck/RxJS,ReactiveX/rxjs,kwonoj/RxJS,kwonoj/RxJS,saneyuki/RxJS,martinsik/rxjs,robwormald/RxJS,figueredo/RxJS,jayphelps/rxjs,figueredo/RxJS,trxcllnt/RxJS,Igorbek/rxjs5,ReactiveX/rxjs,adrianomelo/RxJS-1,IgorMinar/RxJS,adrianomelo/RxJSNext,SangKa/RxJS-Docs-CN,Igorbek/rxjs5,benlesh/RxJS,staltz/RxJSNext,benlesh/RxJS,SangKa/RxJS-Docs-CN,elliotschi/rxjs,ReactiveX/RxJS,kwonoj/RxJS,staltz/RxJSNext,adrianomelo/RxJS-1,RxJS-CN/RxJS-Docs-CN,saneyuki/RxJS,Brocco/RxJS,jayphelps/rxjs,martinsik/rxjs,martinsik/rxjs,jayphelps/rxjs,elliotschi/rxjs,gluck/RxJS,gluck/RxJS