Issue with TrainingArguments docs.
Hi Team,

This is a minor issue but on this [link](https://huggingface.co/transformers/main_classes/trainer.html#transformers.TrainingArguments), the default optimizer mentioned is Adam in the docs. However, the `Trainer` uses AdamW by default.

This is slightly misleading.

Thanks,
Gunjan

Hi! Do you want to open a PR to fix it? Thanks!