fix typo inside bloom documentation
Author: SaulLu
Pull request: yes

# What does this PR do?

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Fixes #18178

As @rhvaz noticed, the current global variable for the documentation of Bloom doesn't give the working snippet. This PR proposes to fix the name of the checkpoint.


## 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?

Anyone in the community is free to review the PR once the tests have passed. 

@sgugger and @younesbelkada, if you want to have a look :slightly_smiling_face: 

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Comments:
_The documentation is not available anymore as the PR was closed or merged._