message: docs(aio): fix issues suggested by Brandon
  PR Close
diff: @@ -277,7 +277,7 @@ To provide better user experience, we show an appropriate error message when the
  </code-example>
  Note that we check if:
  -- the `FormGroup` has the cross validation error returned by the `identityRevealed` validator,
  +- the form has the cross validation error returned by the `identityRevealed` validator,
  - the user is yet to [interact](guide/form-validation#why-check-dirty-and-touched) with the form.
  This completes the cross validation example. We managed to:
  