Update notifier.rst

Author: noniagriconomie

notifier.rst

@@ -60,11 +60,14 @@ Nexmo       ``symfony/nexmo-notifier``       ``nexmo://KEY:SECRET@default?from=F
 OvhCloud    ``symfony/ovhcloud-notifier``    ``ovhcloud://KEY:SECRET@default?from=FROM``
 Sinch       ``symfony/sinch-notifier``       ``sinch://ACCOUNT_ID:AUTH_TOKEN@default?from=FROM``
 FreeMobile  ``symfony/freemobile-notifier``  ``freemobile://LOGIN:PASS@default?phone=PHONE``
-===========  ==============================  ====================================================
+==========  ==============================   ====================================================
 
 .. versionadded:: 5.1
 
     The OvhCloud, Sinch and FreeMobile integrations were introduced in Symfony 5.1.
+
+.. note::
+
     FreeMobile is special, as it allows you to send SMS only to your phone number
     (usefull for alerting purposes).