Add reference and info about added in 6.4

Author: dfridrich

notifier.rst

@@ -111,6 +111,10 @@ Service             Package                                DSN
     via webhooks. See the :doc:`Webhook documentation </webhook>` for more
     details.
 
+.. versionadded:: 7.1
+
+    The `SmsSluzba`_ integration was introduced in Symfony 7.1.
+
 To enable a texter, add the correct DSN in your ``.env`` file and
 configure the ``texter_transports``:
 
@@ -1007,6 +1011,7 @@ is dispatched. Listeners receive a
 .. _`Smsbox`: https://github.com/symfony/symfony/blob/{version}/src/Symfony/Component/Notifier/Bridge/Smsbox/README.md
 .. _`Smsapi`: https://github.com/symfony/symfony/blob/{version}/src/Symfony/Component/Notifier/Bridge/Smsapi/README.md
 .. _`Smsc`: https://github.com/symfony/symfony/blob/{version}/src/Symfony/Component/Notifier/Bridge/Smsc/README.md
+.. _`SmsSluzba`: https://github.com/symfony/symfony/blob/{version}/src/Symfony/Component/Notifier/Bridge/SmsSluzba/README.md
 .. _`SpotHit`: https://github.com/symfony/symfony/blob/{version}/src/Symfony/Component/Notifier/Bridge/SpotHit/README.md
 .. _`Telegram`: https://github.com/symfony/symfony/blob/{version}/src/Symfony/Component/Notifier/Bridge/Telegram/README.md
 .. _`Telnyx`: https://github.com/symfony/symfony/blob/{version}/src/Symfony/Component/Notifier/Bridge/Telnyx/README.md