fix: improve doc link navigation and tree display

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docs/api/math/matrix3/zero.md

@@ -0,0 +1,17 @@
+# Matrix3::Zero
+
+```cpp
+static Matrix3 Zero()
+```
+
+返回零矩阵。
+
+**返回：** `Matrix3` - 零矩阵
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+Matrix3 zero = Matrix3::Zero();
+```