feature #20279 [Mailer] mark Mailtrap as having Webhook support (kbond)

This PR was merged into the 7.2 branch.

Discussion
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[Mailer] mark Mailtrap as having Webhook support

Followup to #20270

Commits
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476c1c1 [Mailer] mark Mailtrap as having Webhook support

Author: OskarStark

mailer.rst

@@ -109,7 +109,7 @@ Service               Install with                                    Webhook su
 `Mailomat`_           ``composer require symfony/mailomat-mailer``    yes
 `MailPace`_           ``composer require symfony/mail-pace-mailer``
 `MailerSend`_         ``composer require symfony/mailer-send-mailer``
-`Mailtrap`_           ``composer require symfony/mailtrap-mailer``
+`Mailtrap`_           ``composer require symfony/mailtrap-mailer``    yes
 `Mandrill`_           ``composer require symfony/mailchimp-mailer``
 `Postal`_             ``composer require symfony/postal-mailer``
 `Postmark`_           ``composer require symfony/postmark-mailer``    yes