[docstring] Fix docstring for `LlamaConfig`
Author: pavaris-pm
Pull request: yes

# What does this PR do?

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Fixes #26638  by fixing a typo in docstring of `LlamaConfig`


## Before submitting
- [x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
- [x] Did you read the [contributor guideline](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md#start-contributing-pull-requests),
      Pull Request section?
- [x] Was this discussed/approved via a Github issue or the [forum](https://discuss.huggingface.co/)? Please add a link
      to it if that's the case.
- [x] Did you make sure to update the documentation with your changes? Here are the
      [documentation guidelines](https://github.com/huggingface/transformers/tree/main/docs), and
      [here are tips on formatting docstrings](https://github.com/huggingface/transformers/tree/main/docs#writing-source-documentation).
- [ ] Did you write any new necessary tests?


## Who can review?
@ydshieh @abzdel
Anyone in the community is free to review the PR once the tests have passed. Feel free to tag
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Models:

- text models: @ArthurZucker and @younesbelkada
- vision models: @amyeroberts
- speech models: @sanchit-gandhi
- graph models: @clefourrier

Library:

- flax: @sanchit-gandhi
- generate: @gante
- pipelines: @Narsil
- tensorflow: @gante and @Rocketknight1
- tokenizers: @ArthurZucker
- trainer: @muellerzr and @pacman100

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Documentation: @stevhliu and @MKhalusova

HF projects:

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- datasets: [different repo](https://github.com/huggingface/datasets)
- diffusers: [different repo](https://github.com/huggingface/diffusers)
- rust tokenizers: [different repo](https://github.com/huggingface/tokenizers)

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Comments:
@ydshieh can you please review this

@abzdel i already passed all 7 CI test cases after following your recommendation. Thank you alex!

> @abzdel i already passed all 7 CI test cases after following your recommendation. Thank you alex!

Awesome! Keep me in the loop if anything else comes up.

Hi, could you run `make fixup` 🙏 Thank you!

@ydshieh roger that! i will run `make fixup` 

The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_26685). All of your documentation changes will be reflected on that endpoint.

@ydshieh already finished running `make fixup`. Now it passed all CI tests. Can you please review it.