[Doc] add qwen3 w4a4 tutorial

[22dimensions]

What this PR does / why we need it?

v0.11.0rc1 will introduce w4a4 quantization feature, so add this tutorial.

Does this PR introduce any user-facing change?

No

How was this patch tested?

• vLLM version: v0.11.0
• vLLM main: vllm-project/vllm@83f478b

[github-actions]

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[gemini-code-assist]

Code Review

This pull request adds a new tutorial for W4A4 quantization with the Qwen3 model. The tutorial is well-structured and provides clear instructions. However, there is a significant error in the title of the tutorial page, which incorrectly states the model size and quantization scheme. This should be corrected to avoid user confusion.

[wangxiyuan]

please push this commit to main branch

[22dimensions]

please push this commit to main branch

main banch pr: #4076