[Fix a small bug]  Misleading use of variable names
Author: anonNo2
Pull request: yes

# What does this PR do?

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Fixes # (issue)  

It's just a small problem, but it may cause misunderstandings for subsequent developers. The author reversed the positions of pred and hypo. This pull request fixes this.


## Before submitting
- [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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      Pull Request section?
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- [ ] Did you write any new necessary tests?


## Who can review?

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Models:

- albert, bert, xlm: @LysandreJik
- blenderbot, bart, marian, pegasus, encoderdecoder,  t5: @patrickvonplaten, @patil-suraj
- longformer, reformer, transfoxl, xlnet: @patrickvonplaten
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- gpt2: @patrickvonplaten, @LysandreJik
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- datasets: [different repo](https://github.com/huggingface/datasets)
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Comments:
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_20465). All of your documentation changes will be reflected on that endpoint.

We do not maintain those examples, they are given as is :-) You can try pinging the original author to see if they agree with the change however.

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/main/CONTRIBUTING.md) are likely to be ignored.