This page lists "Central" versions of the ActiveMQ Artemis JMS Client (from 1.0 to 2.40), and this page links to the release notes for each of these versions.
The mvnrepository.com page also lists "JBoss Releases":
Where are the release notes for the JBoss versions? Which WildFly/JBoss version relates to which "Central" version?
The different tabs here correspond to different Maven repositories. The Apache ActiveMQ community uploads release artifacts to "Central." However, since all Apache code is open source licensed via the Apache License 2.0 then other folks are free to fork the code and perform their own releases on their own Maven repositories.
I imagine that the JBoss and Red Hat repositories contain releases from forks they've created for their own commercial products. These forks were probably based on an Apache community release at some point but have likely diverged over time as most forks do. This is a normal model for "Commercial Open Source."
Therefore, there's no strict 1:1 relationship between the Apache community releases on "Central" and the various releases in the other Maven repos. Also, there's almost certainly no readily available release notes for non-Apache releases. To really understand what's in each release you'd almost certainly have to look at the corresponding source code.