Update the SwiftMailer dev config to match recipe

Author: javiereguiluz

config/packages/dev/swiftmailer.yaml

@@ -1,2 +1,4 @@
+# See https://symfony.com/doc/current/email/dev_environment.html
 swiftmailer:
-    disable_delivery: true
+    #  send all emails to a specific address
+    #delivery_addresses: ['[email protected]']