Docs(IRouteNotifier): show how to use route change correctly

[DevTKSS]

GitHub Issue (If applicable): closes #2663

PR Type

What kind of change does this PR introduce?

• Documentation content changes

What is the current behavior?

The currently shown code sample is using e.Region?.Name which is most of the time I did use it in e.g. my root MainPage with a NavigationView null or empty or if it had a value, that was nothing near the Route/Region names set in the RegisterRoutes Route Map.

What is the new behavior?

as mentioned in the linked issue report to this, we need to use e.Navigator.Route?.ToString() in the event which is returning the Route Name then.

Showing this in a mvvm + mvux realistic usable sample along with Localization might also make this feature of uno easier to understand and implement in our apps.

PR Checklist

Please check if your PR fulfills the following requirements:

• Tested code with current supported SDKs - my app runns on desktop target 👍
• Docs have been added/updated which fit documentation template. (for bug fixes / features)
• Unit Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
• Wasm UI Tests are not showing unexpected any differences. Validate PR Screenshots Compare Test Run results.
• Contains NO breaking changes
• Associated with an issue (GitHub or internal)

Other information

Users could also check out the video tutorial here, but as its only in german localization until now, I did not link it in the docs:
https://youtu.be/RZ3RirA7jhk

Internal Issue (If applicable):

[Copilot]

Pull Request Overview

This PR corrects and significantly expands the documentation for using IRouteNotifier in Uno Platform applications. The key improvement is fixing the incorrect route name access pattern (from e.Region?.Name to e.Navigator.Route?.ToString()), which was returning incorrect or null values.

Key changes:

• Corrected the method for accessing the current route name using e.Navigator.Route?.ToString() instead of e.Region?.Name
• Added comprehensive examples showing how to integrate IRouteNotifier with localization support for both MVVM and MVUX patterns
• Reorganized content with numbered sections and clearer structure

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