message: docs: add note about why module import order is important
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diff: @@ -1661,6 +1661,12 @@ _before_ the `AppRoutingModule`:
  </code-tabs>
  +<div class="alert is-helpful">
  +The import order of the modules is important because the order of the routes defined in the modules affects route matching.
  +If the `AppModule` were imported first, its wildcard route (`path: '**'`) would take precedence over the routes defined in `CrisisCenterModule`.
  +For more information, see the section on [route order](guide/router#route-order).
  +</div>
  +
  Remove the initial crisis center route from the `app-routing.module.ts` because now the `HeroesModule` and the `CrisisCenter` modules provide the feature routes.
  The `app-routing.module.ts` file retains the top-level application routes such as the default and wildcard routes.
  