4.0.5 release notes update

Author: michaelklishin

release-notes/4.0.5.md

@@ -65,7 +65,7 @@ Release notes can be found on GitHub at [rabbitmq-server/release-notes](https://
 
 #### Enhancements
 
- * For virtual hosts that have a [default queue type]() configured, the DQT value is now injected into
+ * For virtual hosts that have a [default queue type](https://www.rabbitmq.com/docs/vhosts#default-queue-type) configured, the DQT value is now injected into
    queue definitions in exported definition documents.
 
    GitHub issue: [#12776](https://github.com/rabbitmq/rabbitmq-server/issues/12776)