message: docs: re-phrase note in architecture guide for clarity
  PR Close
diff: @@ -27,7 +27,7 @@ Here's a simple root NgModule definition.
  <div class="alert is-helpful">
  - The `export` property of `AppComponent` is included here for illustration; it isn't actually necessary in this example. A root NgModule has no reason to *export* anything because other modules don't need to *import* the root NgModule.
  + `AppComponent` is included in the `exports` list here for illustration; it isn't actually necessary in this example. A root NgModule has no reason to *export* anything because other modules don't need to *import* the root NgModule.
  </div>
  