get https://{siteUrl}/modal_form_typeahead_url_path_placeholder
Note: The path is a placeholder. The actual path is determined by the configuration of the app component.
If a modal form field is of type typehead, this operation gets typeahead results to render as a dropdown list.
When the user types into a modal form form field, Asana will send a request containing the entered string to the application's typeahead_url. The list of TypeaheadItems in the response will then be rendered in a dropdown list.
