docs: update containers API docs

docs/api/containers/hashmap/constructor.md

@@ -15,6 +15,10 @@ explicit HashMap(size_t bucketCount, Memory::IAllocator* allocator = nullptr);
 
 **复杂度：** O(bucketCount)，需要初始化所有桶
 
+**线程安全：** ❌ 非线程安全
+
+**异常：** 无
+
 **示例：**
 
 ```cpp
@@ -22,8 +26,7 @@ XCEngine::Containers::HashMap<int, const char*> map1;
 
 XCEngine::Containers::HashMap<int, const char*> map2(32);
 
-auto customAllocator = XCEngine::Memory::GetDefaultAllocator();
-XCEngine::Containers::HashMap<int, const char*> map3(64, customAllocator);
+XCEngine::Containers::HashMap<int, const char*> map3(64, nullptr);
 ```
 
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