docs: update math API docs

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# Vector3::operator-
```cpp
Vector3 operator-(const Vector3& other) const
```
向量减法,将两个向量的对应分量相减。
**参数:**
- `other` - 要减的向量
**返回:** `Vector3` - 相减结果
**线程安全:**
**复杂度:** O(1)
**示例:**
```cpp
Vector3 a(5.0f, 7.0f, 9.0f);
Vector3 b(1.0f, 2.0f, 3.0f);
Vector3 c = a - b; // (4.0f, 5.0f, 6.0f)
```
## 相关文档
- [Vector3 类总览](vector3.md) - 返回类总览
- [`operator+`](operator_add.md) - 加法运算
- [`operator-=`](operator_sub_assign.md) - 减法赋值