[Doc] Add Voxtral to Supported Models page

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Essential Elements of an Effective PR Description Checklist

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan, such as providing test command.
• The test results, such as pasting the results comparison before and after, or e2e results
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.

Purpose

Add Voxtral to Supported Models page. Somehow we missed it before.

Please note that HF format is still not supported yet.

cc @NickLucche @patrickvonplaten

Test Plan

Test Result

(Optional) Documentation Update

[github-actions]

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[gemini-code-assist]

Code Review

This pull request adds Voxtral to the list of supported models in the documentation. My review focuses on ensuring the accuracy of the provided information. I've identified a potential issue where the documentation might be misleading regarding the model's compatibility with the V1 engine's default execution mode, which could cause runtime errors for users. I've suggested a clarification to address this.