Angular 2 TypeScript docs. Fix typos.
Angular 2 TypeScript docs. Fix typos.

derek-duncan/fela,derek-duncan/fela,derek-duncan/fela,risetechnologies/fela,RafalFilipek/fela,as-com/alef,rofrischmann/fela,rofrischmann/fela,derek-duncan/fela,RafalFilipek/fela,derek-duncan/fela,rofrischmann/fela,risetechnologies/fela,risetechnologies/fela,RafalFilipek/fela,RafalFilipek/fela,as-com/alef,derek-duncan/fela,RafalFilipek/fela,RafalFilipek/fela,as-com/alef