message: docs: update file structure document
  Since angular 11 extra package.json isn't generated and with version 12 strict mode is opt out bases.
  Updated document to reflect the state
  Closes
  PR Close
diff: @@ -79,7 +79,7 @@ Files at the top level of `src/` support testing and running your application. S
  <div class="alert is-helpful">
  -If you create an application using Angular's strict mode, you will also have an additional `package.json` file in the `src/app` directory. For more information, see [Strict mode](/guide/strict-mode).
  +New Angular projects use strict mode by default. If this is not desired you can opt-out when creating the project. For more information, see [Strict mode](/guide/strict-mode).
  </div>
  