Update README.md

Author: Light-City

basic_content/vptr_vtable/README.md

@@ -114,9 +114,9 @@ int main(void)
     Base &p = d; // 基类引用指向派生类实例
     cout<<"基类对象直接调用"<<endl;
     ptr.fun1();
-    cout<<"基类引用指向派生类实例"<<endl;
+    cout<<"基类对象调用基类实例"<<endl;
     pp.fun1(); 
-    cout<<"基类指针指向派生类实例并调用虚函数"<<endl;
+    cout<<"基类指针指向基类实例并调用虚函数"<<endl;
     pt->fun1();
     cout<<"基类引用指向基类实例并调用虚函数"<<endl;
     p.fun1();