docs: Update remote-vllm.md with AMD GPU vLLM server supported.

[AlexHe99]

Add the content to use AMD GPU as the vLLM server. Split the original part to two sub chapters,

1. AMD vLLM server
2. NVIDIA vLLM server (orignal)

What does this PR do?

[Provide a short summary of what this PR does and why. Link to relevant issues if applicable.]

Test Plan

[Describe the tests you ran to verify your changes with result summaries. Provide clear instructions so the plan can be easily re-executed.]

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[leseb]

@AlexHe99 see pre-commit errors. Thanks!

[AlexHe99]

@AlexHe99 see pre-commit errors. Thanks!

Hi @leseb , Thanks for your reminding.

It seems that pre-commit prevent any changes of docs/source/distributions/self_hosted_distro/remote-vllm.md b/docs/source/distributions/self_hosted_distro/remote-vllm.md.

Now I move the changes to llama_stack/templates/remote-vllm/doc_template.md which is the template and pre-commit will help auto-syncing the changes to docs/source/distributions/self_hosted_distro/remote-vllm.md.

Thanks,
Alex

[AlexHe99]

the error check by pre-commit of the pre-commit has been fixed now. Please help review the new update commit.