Add Discord notifier

Author: mpiot

notifier.rst

@@ -136,24 +136,25 @@ integration with these chat services:
 ==========  ================================  ===========================================================================
 Service     Package                           DSN
 ==========  ================================  ===========================================================================
-Slack       ``symfony/slack-notifier``        ``slack://default/ID``
-Telegram    ``symfony/telegram-notifier``     ``telegram://TOKEN@default?channel=CHAT_ID``
+Discord     ``symfony/discord-notifier``      ``discord://TOKEN@default?channel=ID``
 GoogleChat  ``symfony/google-chat-notifier``  ``googlechat://ACCESS_KEY:ACCESS_TOKEN@default/SPACE?threadKey=THREAD_KEY``
+LinkedIn    ``symfony/linked-in-notifier``    ``linkedin://TOKEN:USER_ID@default``
 Mattermost  ``symfony/mattermost-notifier``   ``mattermost://TOKEN@ENDPOINT?channel=CHANNEL``
 RocketChat  ``symfony/rocket-chat-notifier``  ``rocketchat://TOKEN@ENDPOINT?channel=CHANNEL``
+Slack       ``symfony/slack-notifier``        ``slack://default/ID``
+Telegram    ``symfony/telegram-notifier``     ``telegram://TOKEN@default?channel=CHAT_ID``
 Zulip       ``symfony/zulip-notifier``        ``zulip://EMAIL:APIKEY@ENDPOINT?channel=CHANNEL``
-LinkedIn    ``symfony/linked-in-notifier``    ``linkedin://TOKEN:USER_ID@default``
 ==========  ================================  ===========================================================================
 
 .. versionadded:: 5.1
 
-    The Mattermost and RocketChat integrations were introduced in Symfony
+    The Mattermost and  RocketChat integrations were introduced in Symfony
     5.1. The Slack DSN changed in Symfony 5.1 to use Slack Incoming
     Webhooks instead of legacy tokens.
 
 .. versionadded:: 5.2
 
-    The GoogleChat, LinkedIn and Zulip integrations were introduced in Symfony 5.2.
+    The GoogleChat, LinkedIn, Zulip and Discord integrations were introduced in Symfony 5.2.
 
 Chatters are configured using the ``chatter_transports`` setting: