 [Doctest] Add `configuration_data2vec_audio.py`
Add `configuration_data2vec_audio.py` to `utils/documentation_tests.txt` for doctest.

Based on issue #19487

@ydshieh could you please take a look at it?
Thanks :)
Could you pull the latest `main` from the remote (which include your PR with other data2vec config files), and rebase your PR branch on the new `main` 🙏 . We need to fix the conflict changes<|||||>@ydshieh rebased the branch, it should resolve the conflict :)<|||||>_The documentation is not available anymore as the PR was closed or merged._