docs: update memory and threading API docs

docs/api/memory/allocator/get-total-freed.md

@@ -18,22 +18,20 @@ virtual size_t GetTotalFreed() const = 0;
 #include <XCEngine/Memory/Allocator.h>
 
 class MyAllocator : public IAllocator {
-    size_t m_freed = 0;
 public:
     void* Allocate(size_t size, size_t alignment = 0) override { return ::operator new(size); }
     
     void Free(void* ptr) override {
         if (ptr) {
-            size_t size = 256; // 需要外部记录
+            // size 需要分配器内部记录或通过其他机制获取
             ::operator delete(ptr);
-            m_freed += size;
         }
     }
     
     void* Reallocate(void* ptr, size_t newSize) override { /* ... */ }
     
     size_t GetTotalAllocated() const override { return 0; }
-    size_t GetTotalFreed() const override { return m_freed; }
+    size_t GetTotalFreed() const override { return 0; }  // 示例未实际统计
     size_t GetPeakAllocated() const override { return 0; }
     size_t GetAllocationCount() const override { return 0; }
     const char* GetName() const override { return "MyAllocator"; }
@@ -42,7 +40,7 @@ public:
 MyAllocator alloc;
 void* ptr = alloc.Allocate(128);
 alloc.Free(ptr);
-size_t freed = alloc.GetTotalFreed(); // 返回 128
+size_t freed = alloc.GetTotalFreed(); // 返回 0（示例未统计）
 ```
 
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