doc(watch_group): Fix comments
doc(watch_group): Fix comments

To sync with 3de00bd4902d20137dad0b551312eceb9a599d98

rkirov/angular.dart,winstonewert/angular.dart,hitesh97/angular.dart,giovannicandido/angular.dart,trinarytree/angular.dart,rkirov/angular.dart,winstonewert/angular.dart,ronlobo/angular.dart,giovannicandido/angular.dart,hitesh97/angular.dart,SibuStephen/angular.dart,SibuStephen/angular.dart,giovannicandido/angular.dart,SibuStephen/angular.dart,trinarytree/angular.dart,winstonewert/angular.dart,ronlobo/angular.dart,ronlobo/angular.dart,trinarytree/angular.dart,hitesh97/angular.dart,SibuStephen/angular.dart,winstonewert/angular.dart,rkirov/angular.dart,rkirov/angular.dart,ronlobo/angular.dart,trinarytree/angular.dart,hitesh97/angular.dart