[Doc] Something wrong in description of 'DistilBertForSequenceClassification' in doc
I think the description of input_ids (one of the parameters) of [DistilBertForSequenceClassification](https://huggingface.co/transformers/model_doc/distilbert.html#distilbertforsequenceclassification) is not correct.
I think the input_ids should be `torch.LongTensor of shape (batch_size, sequence_length)`, rather than `torch.LongTensor of shape (batch_size, num_choices)`.

That's correct, thanks for spotting! Could you open a PR to fix this?

Thanks!