Update SDK_tutorial_online_zh.md

Yabin Li

2023-09-26 2cd86734936847cd9f69a0e01e3477df2d98ea8e

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<maui:MauiWinUIApplication
    x:Class="MauiApp1.WinUI.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:maui="using:Microsoft.Maui"
    xmlns:local="using:MauiApp1.WinUI">
 
</maui:MauiWinUIApplication>