Adding config files for configuration_clip.py
# What does this PR do?

Add config files for configuration_clip.py to utils/documentation_tests.txt for doctest.

Based on issue: https://github.com/huggingface/transformers/issues/19487

@ydshieh could you please check it?
Thanks :)
_The documentation is not available anymore as the PR was closed or merged._<|||||>Hi @soma2000-lang 

#19647 already works on this model config. Could you find another one if you would like to contribute 🙏 . Thank you btw!