Update winui-3-gallery.md

Author: niels9001

hub/includes/winui-3-gallery.md

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         ![The WinUI 3 Gallery app lets you explore and browse interactive examples of WinUI 3 controls, features, and functionality.](../images/winui-gallery-icon.png)
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         The **WinUI 3 Gallery** app lets you explore and browse interactive examples of WinUI 3 controls, features, and functionality. Get the app from the [Microsoft Store](https://apps.microsoft.com/detail/9P3JFPWWDZRC) or get the source code on [GitHub](https://github.com/microsoft/WinUI-Gallery).
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