[Doctest] Add configuration_camembert.py
Author: Saad135
Pull request: yes

# What does this PR do?

Adds configuration_camembert.py to utils/documentation_tests.txt

Based on https://github.com/huggingface/transformers/issues/19487

@ydshieh can you please have a look? thanks :D

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Fixes # (issue)


## Before submitting
- [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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