docs: update RHI API docs

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**命名空间**: `XCEngine::RHI`
**描述**: DirectX 12 栅栏同步对象的 D3D12 实现,继承自 `RHIFence`
**继承自**: `RHIFence`
**描述**: DirectX 12 栅栏同步对象,用于 GPU/CPU 同步和跨队列同步。
## 公共方法
| 方法 | 描述 |
|------|------|
| [`Initialize`](../../../threading/task-system/initialize.md) | 初始化栅栏 |
| [`Shutdown`](../../../threading/task-system/shutdown.md) | 关闭栅栏 |
| [`Initialize`](initialize.md) | 初始化栅栏 |
| [`Shutdown`](shutdown.md) | 关闭并释放资源 |
| [`Signal`](signal.md) | 信号栅栏 |
| [`Wait`](../../../threading/task-group/wait.md) | 等待栅栏 |
| [`Wait`](wait.md) | 等待栅栏 |
| [`GetCompletedValue`](get-completed-value.md) | 获取完成值 |
| [`IsSignaled`](is-signaled.md) | 检查是否已信号 |
| [`GetEventHandle`](get-event-handle.md) | 获取事件句柄 |
| [`GetNativeHandle`](../../buffer/get-native-handle.md) | 获取原生句柄 |
| [`GetNativeHandle`](get-native-handle.md) | 获取原生句柄 |
| [`GetFence`](get-fence.md) | 获取 D3D12 栅栏 |
## 使用示例
```cpp
ID3D12Device* device = /* 获取 D3D12 设备 */;
D3D12Fence fence;
if (!fence.Initialize(device, 0)) {
return false;
}
commandQueue->Signal(&fence, 1);
fence.Wait(1);
```
## 相关文档
- [D3D12 后端总览](../../opengl/overview.md)
- [RHIFence](../../fence/fence.md) - 抽象栅栏接口
- [D3D12 后端总览](../d3d12.md) - D3D12 后端总览
- [RHIFence](../../fence/fence.md) - 抽象栅栏接口