[Doctest] Fix `Perceiver` doctest (#21318)

fix `Perceiver` doctest

src/transformers/models/perceiver/modeling_perceiver.py

@@ -767,7 +767,7 @@ class PerceiverModel(PerceiverPreTrainedModel):
         Examples:
 
         ```python
-        >>> from transformers import PerceiverConfig, AutoTokenizer, PerceiverImageProcessor, PerceiverModel
+        >>> from transformers import PerceiverConfig, PerceiverTokenizer, PerceiverImageProcessor, PerceiverModel
         >>> from transformers.models.perceiver.modeling_perceiver import (
         ...     PerceiverTextPreprocessor,
         ...     PerceiverImagePreprocessor,
@@ -793,7 +793,7 @@ class PerceiverModel(PerceiverPreTrainedModel):
         >>> model = PerceiverModel(config, input_preprocessor=preprocessor, decoder=decoder)
 
         >>> # you can then do a forward pass as follows:
-        >>> tokenizer = AutoTokenizer()
+        >>> tokenizer = PerceiverTokenizer()
         >>> text = "hello world"
         >>> inputs = tokenizer(text, return_tensors="pt").input_ids