Update migration guide

Author: pawlooss1

doc/migrations/6.4.0_6.5.0.md

@@ -34,7 +34,12 @@ Make sure you have all the necessary sections present in the configuration file
 
 ### Custom backends for `mod_event_pusher`
 
-If you have a custom backend implemented for `mod_event_pusher`, you need to update it to handle the `push_event` hook instead of implementing the `mod_event_pusher` behaviour (which no longer exists).
+If you have a custom backend implemented for `mod_event_pusher`, you need to update it to handle the `push_event` hook instead of implementing the `mod_event_pusher` behaviour (which no longer exists). See details in the [module documentation](../modules/mod_event_pusher.md)
+
+### TLS connections to RabbitMQ
+
+Outgoing connections to RabbitMQ can use TLS, both for session mamagement and global distribution.
+See configuration options in [Outgoing connection pools](../configuration/outgoing-connections.md#tls-options)
 
 ### TLS connections to Redis