docs(architecture): remove reference to directives in component metadata (#2481)

public/docs/ts/latest/guide/architecture.jade

@@ -252,7 +252,7 @@ block ts-decorator
     Here are a few of the possible `@Component` configuration options:
 
 :marked
-  - `moduleId: module.id`: sets the base for module-relative loading of the `templateUrl`.
+  - `moduleId`: sets the source of the base address (`module.id`) for module-relative URLs such as the `templateUrl`.
 
   - `selector`: CSS selector that tells Angular to create and insert an instance of this component
   where it finds a `<hero-list>` tag in *parent* HTML.
@@ -261,11 +261,6 @@ block ts-decorator
 
   - `templateUrl`: module-relative address of this component's HTML template, shown [above](#templates).
 
-  - `directives`: !{_array} of the components or directives that *this* template requires.
-  In the last line of `hero-list.component.html`, Angular inserts a `HeroDetailComponent`
-  in the space indicated by `<hero-detail>` tags.
-  Angular does so only if `HeroDetailComponent` is in this `directives` !{_array}.
-
   - `providers`: !{_array} of **dependency injection providers** for services that the component requires.
   This is one way to tell Angular that the component's constructor requires a `HeroService`
   so it can get the list of heroes to display.