Fix a tiny typo in `WhisperForConditionalGeneration::generate` docstring
- [x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).


@sanchit-gandhi 
_The documentation is not available anymore as the PR was closed or merged._<|||||>@sadra-barikbin Thanks for fixing this! 

It seems there is an issue with your CircleCI permissions, the tests won't run.
Could you try refreshing your permissions as shown [here](https://support.circleci.com/hc/en-us/articles/360048210711-How-to-Refresh-User-Permissions-)?<|||||>CircleCI has banned my account. Feel free to make another PR.<|||||>@sadra-barikbin OK - as the changes are small and don't affect code logic, the ci checks aren't critical, so I'm going to merge. 