docs(aio): Fix typo in Architecture Overview. (angular#20073)

aio/content/guide/architecture.md

@@ -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>