Update 3.9.8 release notes

(cherry picked from commit a0d0fbf)

Author: michaelklishin

release-notes/3.9.8.md

@@ -13,11 +13,6 @@ Contributors are encouraged to update them together with their changes. This hel
 
 ### Core Server
 
-#### Enhancements
-
- * ...
-
-
 #### Bug Fixes
 
 * When the mandatory flag was used when publishing to classic queues,
@@ -34,11 +29,12 @@ Contributors are encouraged to update them together with their changes. This hel
   (eg. IP addresses behind a NAT in a Docker deployment). RabbitMQ node hostnames are now advertised as well
   so that other peers can resolve them to get an externally visible IP address.
 
-   GitHub issue: [#53](https://github.com/rabbitmq/osiris/issues/53) 
+  GitHub issue: [rabbitmq/osiris#53](https://github.com/rabbitmq/osiris/issues/53)
+
 
 ## Dependency Upgrades
 
- * ...
+* Osiris was [upgraded to `1.2.2`](https://github.com/rabbitmq/osiris/compare/v1.2.0...v1.2.2)
 
 
 ## Source Code Archives