[Fix doc example] Fix 2 PyTorch Vilt docstring examples
# What does this PR do?

Fix 2 PyTorch Vilt docstring examples
_The documentation is not available anymore as the PR was closed or merged._<|||||>Thanks for fixing, can we add ViLT to the doctests? Namely this file: https://github.com/huggingface/transformers/blob/master/utils/documentation_tests.txt<|||||>> Thanks for fixing, can we add ViLT to the doctests? Namely this file: https://github.com/huggingface/transformers/blob/master/utils/documentation_tests.txt

Added (after discussed with Patrick)<|||||>> Thanks for fixing, can we add ViLT to the doctests? Namely this file: https://github.com/huggingface/transformers/blob/master/utils/documentation_tests.txt

@NielsRogge I added `ViLT` to `documentation_tests.txt`. Do you think this PR is ready for merge? Thanks.<|||||>Will merge later today (unless there is further comment 🙂 )<|||||>Can you confirm the doc tests are passing?<|||||>> Can you confirm the doc tests are passing?

Hi, Yes, I confirmed! Here is the doctest run

https://github.com/huggingface/transformers/runs/5543735270?check_suite_focus=true

