 [Doctest] Add `configuration_data2vec_text.py`
Add `configuration_data2vec_text.py` to `utils/documentation_tests.txt` for doctest.

Based on issue #19487

@ydshieh could you please check it?
Thanks :)
@ydshieh made the suggested changes =)<|||||>_The documentation is not available anymore as the PR was closed or merged._