[Doctest] Add configuration_deberta_v2.py
Author: Saad135
Pull request: yes

# What does this PR do?

Adds configuration_deberta_v2.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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Comments:
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