[AMD] Add AMD performance tuning documentation

[YangWang92]

Add AMD performance tuning documentation including:

1. vLLM patch for sleep mode on AMD GPUs
2. Workarounds for CUDA graph capture issues in ROCm

[CLAassistant]

All committers have signed the CLA.

[yushengsu-thu]

@eric-haibin-lin and @PeterSH6
Could you please check the PR? It looks good to me.
@YangWang92 Added a tutorial to guide AMD users on how to enable the newer vLLM (v0.8) and resolve the sleep mode issue within it making VeRL training more efficient. This PR addresses the question you raised in my previous PR.

[eric-haibin-lin]

Thanks for the PR. Is the vllm PR 12695 expected to be merged in the future?

[YangWang92]

Thanks for the PR. Is the vllm PR 12695 expected to be merged in the future?

Yes, they will: vllm-project/vllm#12695 (comment) .They will merge the pull with ROCm 6.4 released. And I have remindered in the document: you can first use community patched code (from this pull request) to build vLLM from the source code in the corresponding pull request. After the patch merged in vLLM main branch, you can directly install vLLM from the latest version..