typo
Author: mle-els
Pull request: yes

# What does this PR do?

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Fixes # (issue)


## Before submitting
- [x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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Comments:
Do you mind running the code quality checks before we merge? You can do so by running the following from the root of your clone:

```
pip install -e .[quality]
make fixup
```

I can but what is the point of that? I just changed a few letters in a documentation (.rst) file. No programming was involved. The failing check must have been caused by some previous commit.

Good question! The change comes from your modification: the style tool will try to fit all words that fit under the 120 character limit. Since you reduced the amount of characters contained in the line, my intuition tells me that it's trying to fit the word `tasks` in that line.

This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/master/CONTRIBUTING.md) are likely to be ignored.