docs: correct tool calling support for groq llama-guard-4-12b

[GSDV]

Background

The docs for the meta-llama/llama-guard-4-12b model was incorrect. I tried calling meta-llama/llama-guard-4-12b from the Groq provider with tool calls, and it rejected it:

// ...
"data": {
      "error": {
        "message": "`tool calling` is not supported with this model",
        "type": "invalid_request_error"
      }
    }

Summary

I corrected meta-llama/llama-guard-4-12b tool capabilities on the model table.

Checklist

• Tests have been added / updated (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)
• A patch changeset for relevant packages has been added (for bug fixes / features - run pnpm changeset in the project root)
• I have reviewed this pull request (self-review)