4.0.0 GA release is in progress

(cherry picked from commit c03afb2)

Author: michaelklishin

release-notes/4.0.0.md

@@ -1,6 +1,6 @@
-## RabbitMQ 4.0.0-rc.2
+## RabbitMQ 4.0.0
 
-RabbitMQ `4.0.0-rc.2` is a candidate of a new major release.
+RabbitMQ `4.0.0` is a new major release.
 
 Starting June 1st, 2024, community support for this series will only be provided to [regularly contributing users](https://github.com/rabbitmq/rabbitmq-server/blob/main/COMMUNITY_SUPPORT.md)
 and those who hold a valid [commercial support license](https://tanzu.vmware.com/rabbitmq/oss).
@@ -376,5 +376,5 @@ GitHub issues: [#8334](https://github.com/rabbitmq/rabbitmq-server/pull/8334), [
 
 ## Source Code Archives
 
-To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-4.0.0-rc.2.tar.xz`
+To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-4.0.0.tar.xz`
 instead of the source tarball produced by GitHub.