docs(toh-2): copyedits (#3504)
docs(toh-2): copyedits (#3504)


angular/angular-cn,chalin/angular.io,IdeaBlade/angular.io,chalin/angular.io,angular/angular-cn,angular/angular-cn,IdeaBlade/angular.io,angular/angular.io,angular/angular-cn,angular/angular-cn,IdeaBlade/angular.io,chalin/angular.io,chalin/angular.io,IdeaBlade/angular.io,angular/angular.io,angular/angular.io,chalin/angular.io,angular/angular.io,angular/angular.io,IdeaBlade/angular.io