fix: improve doc link navigation and tree display

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docs/api/rhi/command-queue/get-timestamp-frequency.md

@@ -0,0 +1,19 @@
+# RHICommandQueue::GetTimestampFrequency
+
+```cpp
+virtual uint64_t GetTimestampFrequency() const = 0;
+```
+
+获取时间戳频率。
+
+**返回：** 时间戳频率（每秒计数）
+
+**示例：**
+
+```cpp
+uint64_t freq = cmdQueue->GetTimestampFrequency();
+```
+
+## 相关文档
+
+- [RHICommandQueue 总览](command-queue.md) - 返回类总览