Fix string syntax error in logger warning message (additional comma)
Author: xwen99
Pull request: yes

# What does this PR do?

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This warning message was introduced in this PR: https://github.com/huggingface/transformers/pull/21707, but one additional comma exists in the message string: https://github.com/huggingface/transformers/blob/7f4f8b97d03a16f89737ebda4386411f47f4f104/src/transformers/models/blip_2/modeling_blip_2.py#L1607-L1613
Which could cause the following error message as the second part is parsed as an additional argument:
```
File "/newdata/xinwen/miniconda3/lib/python3.10/site-packages/transformers/models/blip_2/modeling_blip_2.py", line 1626, in _preprocess_accelerate
    logger.warning(
Message: 'The `language_model` is not in the `hf_device_map` dictionary and you are running your script in a multi-GPU environment. this may lead to unexpected behavior when using `accelerate`. Please pass a `device_map` that contains `language_model` to remove this warning. Please refer to https://github.com/huggingface/blog/blob/main/accelerate-large-models.md for'
Arguments: (' more details on creating a `device_map` for large models.',)
```

This PR fixes this issue by simply replacing this additional comma.

## Before submitting
- [ ] 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. https://huggingface.co/google/flan-ul2/discussions/6#643a02e5623c970188059c17
- [ ] 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?

Anyone in the community is free to review the PR once the tests have passed.

cc @sgugger

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Comments:
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