[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).
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      Pull Request section?
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      [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 
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- text models: @ArthurZucker and @younesbelkada
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Library:

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- generate: @gante
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- tokenizers: @ArthurZucker
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Comments:
Hey - lmk if you want help fixing CI on this. Looks like it only failed because of a dependency - happy to try to troubleshoot this with you!

@abzdel Hi!, thanks for your help. can you please help me fix this CI? I'm not sure which part make test failed. do you have any idea?

happy to try to troubleshoot this with you too!

@pavaris-pm no worries! When I click the failed task I see this:
![image](https://github.com/huggingface/transformers/assets/55398496/93c15156-bc86-4e6b-b65a-cd7e13efb8bd)

Which makes me think you may have forgotten to run `make fixup` before you committed the change. I would go back, run `make fixup`, commit/push the changes (to your branch) again and see if CI passes. CI should automatically re-run on this PR if you do this, but let me know if other bottlenecks occur here.

@abzdel  Thanks for you help run `make fixup`.  That's very helpful for me. I'll help you take a look at it.

@pavaris-pm it's no problem, let me know if this fixes the issue!

@abzdel i just made a mistake here that cause me to delete the forked repo. i will re-fork repo and do as you recommend. After that, i will mentioned you again with my new PR. Thank you again !