Course doc error in Chapter 7, Fine tuning MLM

There is an error in the Course doc in Chapter 7, Fine tuning MLM:

[Fine-tuning DistilBERT with 🤗 Accelerate](https://huggingface.co/course/chapter7/3?fw=pt#fine-tuning-distilbert-with-accelerate)

This:
``` python
eval_dataset = eval_dataset.rename_columns(
{
"masked_input_ids": "input_ids",
"masked_attention_mask": "attention_mask",
"masked_labels": "labels",
}
)
```

Should be changed to:

``` python
eval_dataset = eval_dataset.rename_columns(
{
"masked_input_ids": "input_ids",
"masked_token_type_ids": "token_type_ids",
"masked_attention_mask": "attention_mask",
"masked_labels": "labels",
}
)
```