[Webhook] Add bridges for Webhook

Author: alexandre-daubois

webhook.rst

@@ -84,13 +84,16 @@ Mailer service  Parser service name
 =============== ==========================================
 Mailgun         ``mailer.webhook.request_parser.mailgun``
 Postmark        ``mailer.webhook.request_parser.postmark``
+Mailjet         ``mailer.webhook.request_parser.mailjet``
+Brevo           ``mailer.webhook.request_parser.brevo``
+Vonage          ``mailer.webhook.request_parser.vonage``
 Sendgrid        ``mailer.webhook.request_parser.sendgrid``
 =============== ==========================================
 
 .. versionadded:: 6.4
 
-    Webhook support for the Sendgrid service was introduced in Symfony 6.4.
-
+    The support for Mailjet, Brevo, Vonage and Sendgrid was introduced in
+    Symfony 6.4.
 
 Set up the webhook in the third-party mailer. For Mailgun, you can do this
 in the control panel. As URL, make sure to use the ``/webhook/mailer_mailgun``