Fix typo in BART CNN/DM finetuning (#1436)
Fix typo in BART CNN/DM finetuning (#1436)

Summary:
Small typo in the inference script, in the README for finetuning BART on CNN/DM dataset.
Pull Request resolved: https://github.com/pytorch/fairseq/pull/1436

Differential Revision: D18809455

Pulled By: myleott

fbshipit-source-id: 272ccda9e6e189123fdf2d516c2659d76f2659a3

pytorch/fairseq,pytorch/fairseq,pytorch/fairseq