docs: update RHI API docs

docs/api/rhi/d3d12/render-target-view/shutdown.md

@@ -0,0 +1,26 @@
+# D3D12RenderTargetView::Shutdown
+
+## 函数签名
+
+```cpp
+void Shutdown()
+```
+
+## 描述
+
+关闭渲染目标视图，释放内部资源。
+
+## 返回值
+
+无
+
+## 示例
+
+```cpp
+rtv.Shutdown();
+```
+
+## 相关文档
+
+- [D3D12RenderTargetView](render-target-view.md) - 类总览
+- [D3D12RenderTargetView::Initialize](initialize.md) - 初始化