docs: fix 404 link
Author: panpan0000
Pull request: yes

# What does this PR do?

ISSUE:
when you go to doc : https://huggingface.co/docs/transformers/main/en/main_classes/trainer#specific-gpus-selection
![image](https://github.com/huggingface/transformers/assets/14049268/359c2a4f-95e0-45cd-8db6-31fccea48617)

the link is 404 due to URL is case sentitive.
![image](https://github.com/huggingface/transformers/assets/14049268/06d2c6f9-7cd8-48ad-ad8f-03b32063f563)



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Fixes # (issue)


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Comments:
@amyeroberts , Many thanks to your kindly review and help.

But the check was unsuccessful and I was lost.
![image](https://github.com/huggingface/transformers/assets/14049268/cb4c2ccb-c6d2-4b7f-8493-ee64eeecd369)

detail log as below
![image](https://github.com/huggingface/transformers/assets/14049268/98c34d7a-860d-4c0a-8c6f-8e0ec3ecb30e)
but even I ran `make quality` on main head 06343b06335a1f8417bd32d3ffc7cf2cca9a24ac ,  it failed 
```
Oh no! 💥 💔 💥
3 files would be reformatted, 2678 files would be left unchanged.
```

 or run on my PR with command  `doc-builder style src/transformers docs/source --max_len 119 --check_only --path_to_docs docs/source`, it was succesful.


@panpan0000 Unfortunately we had some package dependency nightmares this week. The fix was pushed to main - I can see you've rebased to get the updates and it's all working now ❤️ 

Thank you for your patience and for looking into the issue. Once the final build PR documentation run has finished we can merge :) 

awesome @amyeroberts , nice community here!