minor #2604 [Notify] Update image link for native notification example (skmedix)

This PR was merged into the 2.x branch.

Discussion
----------

[Notify] Update image link for native notification example

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Issues        | -
| License       | MIT

<!--
Replace this notice by a description of your feature/bugfix.
This will help reviewers and should be a good start for the documentation.

Additionally (see https://symfony.com/releases):
 - Always add tests and ensure they pass.
 - For new features, provide some code snippets to help understand usage.
 - Features and deprecations must be submitted against branch main.
 - Changelog entry should follow https://symfony.com/doc/current/contributing/code/conventions.html#writing-a-changelog-entry
 - Never break backward compatibility (see https://symfony.com/bc).
-->

A very minor issue I noticed while looking through the repositories

Commits
-------

ef62813 [Notify] Update image link for native notification example

Author: Kocal

src/Notify/README.md

@@ -5,7 +5,7 @@ Symfony UX Notify is a Symfony bundle integrating server-sent
 in Symfony applications using [Mercure](https://mercure.rocks/).
 It is part of [the Symfony UX initiative](https://ux.symfony.com/).
 
-![Example of a native notification](https://github.com/symfony/ux/blob/2.x/doc/native-notification-example.png?raw=true)
+![Example of a native notification](doc/native-notification-example.png)
 
 **This repository is a READ-ONLY sub-tree split**. See
 https://github.com/symfony/ux to create issues or submit pull requests.