docs(di): fix code snippet

public/docs/ts/latest/guide/dependency-injection.jade

@@ -302,10 +302,10 @@ include ../../../../_includes/_util-fns
   Mission accomplished!  We don't even need the Angular Dependency Injection system to test the `HeroesComponent`.
   We simply create a bew `HeroesComponent` with a mock service and poke at it:
   ```
-  it("should have heroes when created") {
+  it("should have heroes when created", () => {
     let hc = new HeroesComponent(mockService);
     expect(hc.heroes.length).toEqual(mockService.getHeroes().length);
-  }
+  })
   ```
   ### When the service needs a service 
   Our `HeroService` is very simple. It doesn't have any dependencies of its own.