[Tokenizers] Fix a small typo (#21104)

* typo

* change name in `__repr__`

* fix my mistake

src/transformers/tokenization_utils_base.py

@@ -1572,8 +1572,8 @@ class PreTrainedTokenizerBase(SpecialTokensMixin, PushToHubMixin):
 
     def __repr__(self) -> str:
         return (
-            f"{'PreTrainedTokenizerFast' if self.is_fast else 'PreTrainedTokenizer'}(name_or_path='{self.name_or_path}',"
-            f" vocab_size={self.vocab_size}, model_max_len={self.model_max_length}, is_fast={self.is_fast},"
+            f"{self.__class__.__name__}(name_or_path='{self.name_or_path}',"
+            f" vocab_size={self.vocab_size}, model_max_length={self.model_max_length}, is_fast={self.is_fast},"
             f" padding_side='{self.padding_side}', truncation_side='{self.truncation_side}',"
             f" special_tokens={self.special_tokens_map_extended})"
         )