message: docs(aio): fix broken NgModules link in tutorial
  Brackets included in link title contents were breaking markdown
  parsing, preventing correct link generation.
diff: @@ -276,7 +276,7 @@ This module declares only the two application components, `AppComponent` and `He
  -Read more about Angular modules in the [NgModules](guide/ngmodule "Angular Modules (NgModule)") guide.
  +Read more about Angular modules in the [NgModules](guide/ngmodule "Angular Modules") guide.
  </div>
  