[docstring] fix docstring `DPRConfig` (#26674)

* fix docstring dpr config

* fix style

* Update descp
Co-authored-by: Yih-Dar <2521628+ydshieh@users.noreply.github.com>

---------
Co-authored-by: Yih-Dar <2521628+ydshieh@users.noreply.github.com>

src/transformers/models/dpr/configuration_dpr.py

@@ -83,6 +83,8 @@ class DPRConfig(PretrainedConfig):
             The standard deviation of the truncated_normal_initializer for initializing all weight matrices.
         layer_norm_eps (`float`, *optional*, defaults to 1e-12):
             The epsilon used by the layer normalization layers.
+        pad_token_id (`int`, *optional*, defaults to 0):
+            Padding token id.
         position_embedding_type (`str`, *optional*, defaults to `"absolute"`):
             Type of position embedding. Choose one of `"absolute"`, `"relative_key"`, `"relative_key_query"`. For
             positional embeddings use `"absolute"`. For more information on `"relative_key"`, please refer to

utils/check_docstrings.py

@@ -143,7 +143,6 @@ OBJECTS_TO_IGNORE = [
     "CvtConfig",
     "CvtModel",
     "DeiTImageProcessor",
-    "DPRConfig",
     "DPRReaderTokenizer",
     "DPRReaderTokenizerFast",
     "DPTModel",