docs: Add a understand comment to ASyncActionDialog slots connection.

src/dialogs/AsyncActionDialog.cpp

@@ -18,6 +18,7 @@ AsyncActionDialog::AsyncActionDialog(AsyncAction* aAsyncAction,const QString& aT
 
     initializeTitle(aTitle);
     initializeProgressBar();
+    //注意本处的connect连接的槽函数是一个虚函数，会在子类中被override
     connect(mAction,&AsyncAction::actionCompleted,this,&AsyncActionDialog::handleFinishedAction);
 
     mLayout->setSpacing(10);