docs: update RHI API docs

docs/api/rhi/d3d12/command-list/copy-resource.md

@@ -10,8 +10,18 @@ void CopyResource(void* dst, void* src) override;
 - `dst` - 目标资源指针
 - `src` - 源资源指针
 
-**复杂度：** O(n)
+**复杂度：** O(n)，n 为资源大小
+
+**示例：**
+
+```cpp
+ID3D12Resource* dst = /* 目标资源 */;
+ID3D12Resource* src = /* 源资源 */;
+cmdList.CopyResource(dst, src);
+```
 
 ## 相关文档
 
 - [D3D12CommandList 总览](command-list.md) - 返回类总览
+- [CopyBuffer](copy-buffer.md) - 复制缓冲区数据
+- [CopyTexture](copy-texture.md) - 复制纹理数据