Add type hints to XLM-Roberta-XL models
This PR adds type hints for the PyTorch XLM-Roberta-XL as mentioned in #16059 
@Rocketknight1
_The documentation is not available anymore as the PR was closed or merged._<|||||>Hello @Rocketknight1 , just reminding you of this <|||||>Hi @asofiaoliveira, I'm extremely sorry for the delay here! The PR is perfect, and I'm merging now!