[Doc][AMD][ROCm]Added tips to refer to mi300x tuning guide for mi300x users

[hongxiayang]

Added tips to refer to MI300x tuning guide for MI300x (gfx942) users for performance and tuning tips on system level and workflow level.

FIX #xxxx (link existing issues this PR will resolve)

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[github-actions]

👋 Hi! Thank you for contributing to the vLLM project.
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[hongxiayang]

/ready

This is a simple doc update to refer to a public link in order to avoid re-writing all the tips in vllm code base.

[WoosukKwon]

LGTM! Thanks for adding it!