message: docs(aio): Fix typo in Architecture Overview.
diff: @@ -78,7 +78,7 @@ Here's a simple root module:
  <div class="l-sub-section">
  - The `export` of `AppComponent` is just to show how to export; it isn't actually necessary in this example. A root module has no reason to _export_ anything because other components don't need to _import_ the root module.
  + The `export` of `AppComponent` is just to show how to use the `exports` array to export a component; it isn't actually necessary in this example. A root module has no reason to _export_ anything because other components don't need to _import_ the root module.
  </div>
  