Merge branch '7.0' into 7.1

* 7.0:
  [Mailer] Updated webhook support in Mailer bridge overview for 6.4

Author: OskarStark

mailer.rst

@@ -115,7 +115,7 @@ Service               Install with                                    Webhook su
 `Mandrill`_           ``composer require symfony/mailchimp-mailer``
 `Postmark`_           ``composer require symfony/postmark-mailer``    yes
 `Scaleway`_           ``composer require symfony/scaleway-mailer``
-`SendGrid`_           ``composer require symfony/sendgrid-mailer``
+`SendGrid`_           ``composer require symfony/sendgrid-mailer``    yes
 ===================== =============================================== ===============
 
 .. versionadded:: 7.1