Add reference and info about added in 6.4

Author: dfridrich

notifier.rst

@@ -122,7 +122,7 @@ Service             Package                                DSN
 
 .. versionadded:: 6.4
 
-    The `Redlink`_ and `Brevo`_ integrations were introduced in Symfony 6.4.
+    The `Redlink`_, `Brevo`_ and `SmsSluzba`_ integrations were introduced in Symfony 6.4.
 
 .. deprecated:: 6.4
 
@@ -1055,6 +1055,7 @@ is dispatched. Listeners receive a
 .. _`SmsBiuras`: https://github.com/symfony/symfony/blob/{version}/src/Symfony/Component/Notifier/Bridge/SmsBiuras/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