[Accessibility] Document XYFocusKeyboardNavigation

[citelao]

Issue type

sample request

Which version of the app?

WinUI 3 Gallery

Description

XAML offers built-in support for arrow key navigation, XYFocusKeyboardNavigation. We should document it.

• https://learn.microsoft.com/en-us/windows/apps/design/input/keyboard-interactions#arrow-key-navigation
• https://learn.microsoft.com/en-us/windows/apps/design/input/gamepad-and-remote-interactions#xy-focus-navigation-and-interaction
• https://learn.microsoft.com/en-us/uwp/api/windows.ui.xaml.uielement.xyfocuskeyboardnavigation?view=winrt-22621
• https://learn.microsoft.com/en-us/uwp/api/windows.ui.xaml.input.xyfocuskeyboardnavigationmode?view=winrt-22621

Screenshots

No response

Windows version

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Additional context

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