update zh-cn/application-dev/ability/stage-brief.md.

Signed-off-by: N 葛亚芳 <geyafang@huawei.com>

update zh-cn/application-dev/ability/stage-brief.md.
Signed-off-by: N 葛亚芳 <geyafang@huawei.com>
7725b300 · 葛亚芳 · Gitee · 2e80e6b3 · 7725b300
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@@ -112,5 +112,6 @@ Stage模型的应用包的工程目录结构，请参考[OpenHarmony工程介绍
 针对Stage模型下的Ability开发，有以下相关实例可供参考：
 - [`StageModel`：Stage模型（eTS）（API9）（Full SDK）](https://gitee.com/openharmony/applications_app_samples/tree/master/ability/StageModel)
+- [`WindowExtAbility`：窗口扩展（eTS）（API9）（Full SDK）](https://gitee.com/openharmony/applications_app_samples/tree/master/ability/WindowExtAbility)
 - [`MissionManager`：系统任务管理（eTS）（API9）（Full SDK）](https://gitee.com/openharmony/applications_app_samples/tree/master/ability/MissionManager)
 - [`Launcher`：仿桌面应用（eTS）（API9）（Full SDK）](https://gitee.com/openharmony/applications_app_samples/tree/master/ability/Launcher)