docs: update math API docs

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# Vector3::operator==
```cpp
bool operator==(const Vector3& other) const
```
判断两个向量是否相等。使用 EPSILON 进行浮点数比较。
**参数:**
- `other` - 要比较的向量
**返回:** `bool` - 如果两个向量相等返回 true否则返回 false
**线程安全:**
**复杂度:** O(1)
**示例:**
```cpp
Vector3 a(1.0f, 2.0f, 3.0f);
Vector3 b(1.0f, 2.0f, 3.0f);
Vector3 c(1.0f, 2.0f, 3.00001f);
bool equal1 = (a == b); // true
bool equal2 = (a == c); // true因为差异在 EPSILON 内)
```
## 相关文档
- [Vector3 类总览](vector3.md) - 返回类总览
- [`operator!=`](operator_neq.md) - 不等比较