Added documentation for DagsHubCallback
Author: jinensetpal
Pull request: yes

# What does this PR do?

Adds documentation for [DagsHubCallback](https://github.com/huggingface/transformers/blob/59d5edef34ae0fa56065a2e863736d4f133c558b/src/transformers/integrations.py#L1054-L1100)!
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## Before submitting
- [x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
- [ ] Did you read the [contributor guideline](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md#start-contributing-pull-requests),
      Pull Request section?
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      to it if that's the case.
- [ ] 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?

@sgugger, please and thank you! 🙂 

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Models:

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Comments:
_The documentation is not available anymore as the PR was closed or merged._