Update DBRX docs to reference re-uploaded checkpoint
Author: qgallouedec
Pull request: yes

# What does this PR do?

https://gtihub.com/databricks/dbrx-instruct and https://huggingface.co/databricks/dbrx-instruct are now closed (do you know why?)

It implies some updates in the doc to avoid dead links. I suggest that we re-upload the checkpoints to `transformers-community`.

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Comments:
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_43196). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

Nice! Do you know if they maybe migrated their org somewhere else?
Otherwise, did you already re-uploaded them?

I have no idea, my guess is that they silently closed it. Tagging @srowen @matthayes in case they have an answer.

> Otherwise, did you already re-uploaded them?

I was waiting for approval on this one, I'll re-upload this afternoon

**[For maintainers]** Suggested jobs to run (before merge)

run-slow: dbrx