Merge beta with rc1

Author: kilfoyle

docs/en/install-upgrade/release-notes/release-notes-fleet-agent.asciidoc

@@ -7,7 +7,6 @@
 This section summarizes the changes in each release.
 
 * <<release-notes-fleet-agent-9.0.0-rc1>>
-* <<release-notes-fleet-agent-9.0.0-beta1>>
 
 Also see: