docs(Observable): update forEach jsdoc to include PromiseCtor
docs(Observable): update forEach jsdoc to include PromiseCtor

- fix typo in jsdoc lift params for `operator`

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