[Notifier] Add Matrix Synapse bridge

Author: chii0815

notifier.rst

@@ -369,6 +369,7 @@ Service                                  Package                               D
 `LinkedIn`_                              ``symfony/linked-in-notifier``        ``linkedin://TOKEN:USER_ID@default``
 `Mastodon`_                              ``symfony/mastodon-notifier``         ``mastodon://ACCESS_TOKEN@HOST``
 `Mattermost`_                            ``symfony/mattermost-notifier``       ``mattermost://ACCESS_TOKEN@HOST/PATH?channel=CHANNEL``
+`Matrix Synapse`_                        ``symfony/matrix-notifier``           ``matrix://HOST:PORT/?accessToken=ACCESSTOKEN&ssl=SSL``
 `Mercure`_                               ``symfony/mercure-notifier``          ``mercure://HUB_ID?topic=TOPIC``
 `MicrosoftTeams`_                        ``symfony/microsoft-teams-notifier``  ``microsoftteams://default/PATH``
 `RocketChat`_                            ``symfony/rocket-chat-notifier``      ``rocketchat://TOKEN@ENDPOINT?channel=CHANNEL``
@@ -392,6 +393,10 @@ Service                                  Package                               D
     The ``Gitter`` integration was removed in Symfony 7.2 because that service
     no longer provides an API.
 
+.. versionadded:: 7.3
+
+    The ``Matrix Synapse`` integration was introduced in Symfony 7.3.
+
 .. warning::
 
     By default, if you have the :doc:`Messenger component </messenger>` installed,