message: docs: add app.module to changed documents
  PR Close
diff: @@ -142,6 +142,9 @@ Here are the code files discussed on this page and your app should look like thi
  <code-pane title="src/app/heroes/heroes.component.html" path="toh-pt3/src/app/heroes/heroes.component.html">
  </code-pane>
  + <code-pane title="src/app/app.module.ts" path="toh-pt3/src/app/app.module.ts">
  + </code-pane>
  +
  </code-tabs>
  ## Summary
  