[DOCS] Removed links to pre-release RNs.
This section summarizes the changes in each release.
* <<release-notes-6.0.0>>
-* <<release-notes-6.0.0-rc2>>
-* <<release-notes-6.0.0-rc1>>
-* <<release-notes-6.0.0-beta2>>
-* <<release-notes-6.0.0-beta1>>
-* <<release-notes-6.0.0-alpha2>>
-* <<release-notes-6.0.0-alpha1>>
-* <<release-notes-6.0.0-alpha1-5x>>
--
include::release-notes/6.0.0.asciidoc[]
