[DOCS] Fix the code block in the changelog

Releases: main
Resolves: #96783
Change-Id: Ic4a36692a7dfffacca062e3c54e0ade1d8cda5ab
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/73352


Reviewed-by: Mathias Brodala <mbrodala@pagemachine.de>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>

typo3/sysext/core/Documentation/Changelog/12.0/Feature-94544-AddNewSMTPConfigurationSettings.rst

@@ -31,6 +31,7 @@ It is now also possible to define an array with SMTP stream options in the Addit
 Configuration Example:
 
 .. code-block:: php
+
     return [
         //....
         'MAIL' => [