[DOCS] Fix code examples in changelog

Additionally remove an outdated warning.

Resolves: #101490
Related: #99220
Releases: main, 12.4
Change-Id: I0943ffa2097bd5284aa91d0bb6180a789e28e89f
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/80222
Reviewed-by: Chris M�ller <typo3@krue.ml>
Tested-by: Chris M�ller <typo3@krue.ml>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>

typo3/sysext/core/Documentation/Changelog/12.2/Feature-99220-AddEventToModifySearchResults.rst

@@ -28,12 +28,11 @@ custom actions.
 Example
 -------
 
-..  warning::
-    Some code in this example is experimental API and may change until TYPO3 v12 LTS.
-
 ..  code-block:: php
     :caption: EXT:my_extension/Classes/Search/EventListener/AddLiveSearchResultActionsListener.php
 
+    <?php
+
     namespace MyVendor\MyExtension\Search\EventListener;
 
     use TYPO3\CMS\Backend\Routing\UriBuilder;
@@ -84,9 +83,8 @@ Example
     :caption: EXT:my_extension/Configuration/Services.yaml
 
     MyVendor\MyExtension\Search\EventListener\AddLiveSearchResultActionsListener:
-    tags:
-      -
-        name: event.listener
-        identifier: 'my-extension/add-live-search-result-actions-listener'
+      tags:
+        - name: event.listener
+          identifier: 'site/add-live-search-result-actions-listener'
 
 .. index:: Backend, ext:backend