docs: 更新 containers 和 threading 模块文档

- containers: 更新 string 类的多个方法文档
- threading: 更新 mutex 和 task-group 方法文档

docs/api/resources/mesh/mesh.md

@@ -78,7 +78,7 @@ struct MeshSection {
 
 ```cpp
 #include "XCEngine/Resources/Mesh.h"
-#include "XCEngine/Containers/Array.h"
+#include "XCEngine/Core/Containers/Array.h"
 
 using namespace XCEngine;
 using namespace Resources;