[DOC] update v1_guide with INTEL HW

[xuechendi]

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

Noticed that V1 document doesn't include Intel GPU and Gaudi information, update with this PR

Test Plan

Test Result

(Optional) Documentation Update

[github-actions]

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[gemini-code-assist]

Code Review

This pull request updates the vLLM V1 guide to include information about support for Intel hardware. Specifically, it adds 'INTEL GPU' to the list of supported hardware with a 'functional' status, and adds a link to the vllm-gaudi repository in the list of hardware support plugins. The changes are accurate and correctly reflect the project's support for Intel GPUs via the XPU backend and for Gaudi accelerators via a dedicated plugin/fork. The documentation update is clear and well-placed within the existing structure. I have no major concerns with this change.

[DarkLight1337]

Thanks for updating