Rename header to AEPSwiftUI for 5.1.0-beta

aepsdk-ui-ios hosts multiple modules currently and the current
release corresponds to a new module AEPSwiftUI. However, due to
the existing mapping, the release notes task generated its header
as `Notification Content Extension`.

Rename the current instance to `AEPSwiftUI`.

src/pages/home/release-notes/index.md

@@ -9,7 +9,7 @@ Keywords:
 
 ## September 4, 2024
 
-### iOS Notification Content Extension 5.1.0-beta
+### AEPSwiftUI 5.1.0-beta
 
 Initial release of `AEPSwiftUI` framework for Adobe Experience Platform Mobile SDKs on iOS. The `AEPSwiftUI` framework provides out-of-the-box UI components for use with Adobe Journey Optimizer content cards.