Typo fixed (line 219) in german translation. Documentation: @sgugger @ydshieh
Author: kant
Pull request: yes

# What does this PR do?
Typo fixed (line 219) in german translation
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Fixes # (issue)
No fix on previous issue, but related to this #19443 

## 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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- [ ] Did you write any new necessary tests?


## Who can review?

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Models:

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- longformer, reformer, transfoxl, xlnet: @patrickvonplaten
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- gpt2: @patrickvonplaten, @LysandreJik
- rag: @patrickvonplaten, @lhoestq
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Comments:
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_20150). All of your documentation changes will be reflected on that endpoint.

Like in your other PRs, the tests are not run.
Could you try refreshing your permissions as shown [here](https://support.circleci.com/hc/en-us/articles/360048210711-How-to-Refresh-User-Permissions-)?

Done the steps. But failed from this side.

You might need to push an empty commit to retrigger the tests.

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.