docs: update RHI API docs
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# D3D12Common::CreateUAVBarrier
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```cpp
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inline D3D12_RESOURCE_BARRIER CreateUAVBarrier(ID3D12Resource* resource = nullptr)
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```
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创建无序访问视图(UAV)屏障,用于同步 UAV 访问。
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**参数:**
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- `resource` - UAV 资源指针,默认为 `nullptr`(全局 UAV 屏障)
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**返回:** 配置好的 `D3D12_RESOURCE_BARRIER` 结构
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**线程安全:** ✅(纯函数)
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**示例:**
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```cpp
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ID3D12Resource* uavResource = ...;
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D3D12_RESOURCE_BARRIER barrier = CreateUAVBarrier(uavResource);
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cmdList->ResourceBarrier(1, &barrier);
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```
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## 相关文档
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- [D3D12Common 总览](common.md)
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- [CreateTransitionBarrier](create-transition-barrier.md)
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