Removing duplicate reference to updated API (#3742)

* Updating release notes and downloads for 1.4 experimental

* Minor wording revisions

* Release notes for 1.3.2

* Adding first release notes for 1.4-preview1

* Release notes for 1.3.3

* Fixing broken bookmark links

* Updating 1.4-preview1 rel notes

* Removing en-us from link

* Adding release notes and downloads for 1.4-preview2

* Fixing bookmark

* Tweaking wording for XAML Islands section

* Minor wording tweaks

* Clarifying wording for custom titlebar scenarios

* Update preview-channel.md (#3728)

minor revs

* Adding release notes and downloads for WASDK 1.4.0 stable

* Updating wording for ItemsView section

* Removing comment referring to preview release

* Removing duplicate reference to Popup/FlyoutBase.ShouldConstrainToRootBounds

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Co-authored-by: KB <[email protected]>

Author: duncanmacmichael

hub/apps/windows-app-sdk/stable-channel.md

@@ -64,7 +64,6 @@ We're introducing a new list control called the `ItemsView` and a corresponding
 ### New features from across the WinAppSDK
 
 - A new `ThemeSettings` class that allows Win32 WinRT apps to detect when the system's High Contrast setting has changed, similar to UWP's [AccessibilitySettings](/uwp/api/windows.ui.viewmanagement.accessibilitysettings) class. See the [ThemeSettings API spec](https://github.com/microsoft/WindowsAppSDK/blob/main/specs/themes/ThemeSettings.md) on GitHub for more information.
-- `Popup/FlyoutBase.ShouldConstrainToRootBounds` is now supported to allow tooltips, menus, and other popups to extend outside the bounds of the main window.
 - `AccessKeyManager.EnterDisplayMode` is a new method to display access keys for the current focused element of a provided root. Access keys are in "display mode" when showing a key tip to invoke a command, such as pressing the Alt key in Paint to show what keys correspond to what controls. This method allows for programmatically entering display mode.
 - `Application.ResourceManagerRequested` provides a mechanism to provide a different `IResourceManager` to resolve resource URIs for scenarios when the default `ResourceManager` won't work. For more information, see the [Application.ResourceManagerRequested API spec](https://github.com/microsoft/microsoft-ui-xaml/blob/main/specs/custom-iresourcemanager-spec.md) on GitHub.
 - The version of the WebView2 SDK was updated from 1661.34 to [1823.32](/microsoft-edge/webview2/release-notes?tabs=winrtcsharp#10182332).