[docstring] Update GPT2 and Whisper (#26642)

* [DOCS] Update docstrings for  and  tokenizer

* [DOCS] add pad_token argument to whisper tokenizer docstring

* [FIX] Reword pad_token description

* [CHORE] Apply style formatting

---------

Co-authored-by: jmcdonnell <jmcdonnell@fieldbox.ai>

utils/check_docstrings.py

@@ -316,9 +316,6 @@ OBJECTS_TO_IGNORE = [
     "FlavaTextModel",
     "FocalNetModel",
     "FunnelTokenizerFast",
-    "GPT2Config",
-    "GPT2Tokenizer",
-    "GPT2TokenizerFast",
     "GPTBigCodeConfig",
     "GPTJConfig",
     "GPTNeoXConfig",
@@ -789,8 +786,6 @@ OBJECTS_TO_IGNORE = [
     "WhisperConfig",
     "WhisperFeatureExtractor",
     "WhisperForAudioClassification",
-    "WhisperTokenizer",
-    "WhisperTokenizerFast",
     "XCLIPTextConfig",
     "XCLIPVisionConfig",
     "XGLMConfig",