Docs: change some `input_ids` doc reference from `BertTokenizer` to `AutoTokenizer` 
# What does this PR do?

As the title indicates. We are doing it in most places, but there were a few places with the old pattern.

(detected it as part of https://github.com/huggingface/transformers/issues/24575)
_The documentation is not available anymore as the PR was closed or merged._