Fix docs Pop2Piano (#30140)

fix copies

src/transformers/models/pop2piano/tokenization_pop2piano.py

@@ -73,6 +73,16 @@ class Pop2PianoTokenizer(PreTrainedTokenizer):
             Determines the default velocity to be used while creating midi Notes.
         num_bars (`int`, *optional*, defaults to 2):
             Determines cutoff_time_idx in for each token.
+        unk_token (`str` or `tokenizers.AddedToken`, *optional*, defaults to `"-1"`):
+            The unknown token. A token that is not in the vocabulary cannot be converted to an ID and is set to be this
+            token instead.
+        eos_token (`str` or `tokenizers.AddedToken`, *optional*, defaults to 1):
+            The end of sequence token.
+        pad_token (`str` or `tokenizers.AddedToken`, *optional*, defaults to 0):
+             A special token used to make arrays of tokens the same size for batching purpose. Will then be ignored by
+            attention mechanisms or loss computation.
+        bos_token (`str` or `tokenizers.AddedToken`, *optional*, defaults to 2):
+            The beginning of sequence token that was used during pretraining. Can be used a sequence classifier token.
     """
 
     model_input_names = ["token_ids", "attention_mask"]