Remove `utils/documentation_tests.txt` (#26213)

* update

* update

---------
Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>

docs/README.md

@@ -364,9 +364,6 @@ We use pytests' [doctest integration](https://docs.pytest.org/doctest.html) to v
 For Transformers, the doctests are run on a daily basis via GitHub Actions as can be 
 seen [here](https://github.com/huggingface/transformers/actions/workflows/doctests.yml).
 
-To include your example in the daily doctests, you need to add the filename that
-contains the example docstring to the [documentation_tests.txt](../utils/documentation_tests.txt).
-
 ### For Python files
 
 Run all the tests in the docstrings of a given file with the following command, here is how we test the modeling file of Wav2Vec2 for instance:

docs/source/en/add_tensorflow_model.md

@@ -229,7 +229,6 @@ documentation pages. You can complete this part entirely following the patterns
 changes:
 - Include all public classes of *BrandNewBert* in `src/transformers/__init__.py`
 - Add *BrandNewBert* classes to the corresponding Auto classes in `src/transformers/models/auto/modeling_tf_auto.py`
-- Include the modeling file in the documentation test file list in `utils/documentation_tests.txt`
 - Add the lazy loading classes related to *BrandNewBert* in `src/transformers/utils/dummy_tf_objects.py`
 - Update the import structures for the public classes in `src/transformers/models/brand_new_bert/__init__.py`
 - Add the documentation pointers to the public methods of *BrandNewBert* in `docs/source/en/model_doc/brand_new_bert.md`

docs/source/ko/add_tensorflow_model.md

@@ -175,7 +175,6 @@ git push -u origin add_tf_brand_new_bert
 
 - `src/transformers/__init__.py`에 *BrandNewBert*의 모든 공개 클래스를 포함합니다.
 - `src/transformers/models/auto/modeling_tf_auto.py`에서 *BrandNewBert* 클래스를 해당 Auto 클래스에 추가합니다.
-- `utils/documentation_tests.txt`에 모델 파일을 문서화하는 테스트 파일 목록을 추가합니다.
 - `src/transformers/utils/dummy_tf_objects.py`에 *BrandNewBert*와 관련된 레이지 로딩 클래스를 추가합니다.
 - `src/transformers/models/brand_new_bert/__init__.py`에서 공개 클래스에 대한 import 구조를 업데이트합니다.
 - `docs/source/en/model_doc/brand_new_bert.md`에서 *BrandNewBert*의 공개 메서드에 대한 문서 포인터를 추가합니다.

utils/not_doctested.txt

@@ -431,7 +431,6 @@ src/transformers/models/blip/modeling_blip_text.py
 src/transformers/models/blip/modeling_tf_blip_text.py
 src/transformers/models/blip_2/configuration_blip_2.py
 src/transformers/models/blip_2/convert_blip_2_original_to_pytorch.py
-src/transformers/models/blip_2/modeling_blip_2.py
 src/transformers/models/bloom/convert_bloom_original_checkpoint_to_pytorch.py
 src/transformers/models/bloom/modeling_bloom.py
 src/transformers/models/bloom/modeling_flax_bloom.py