Remove links to release notes

docs/reference/release-notes.asciidoc

@@ -3,19 +3,5 @@
 
 [partintro]
 --
-This section summarizes the changes in each release.
-
-* <<release-notes-5.0.0-alpha5>>
-* <<release-notes-5.0.0-alpha4>>
-* <<release-notes-5.0.0-alpha3>>
-* <<release-notes-5.0.0-alpha2>>
-* <<release-notes-5.0.0-alpha1>>
-* <<release-notes-5.0.0-alpha1-2x>>
-
+This section will summarize the changes in released versions.
 --
-include::release-notes/5.0.0-alpha5.asciidoc[]
-include::release-notes/5.0.0-alpha4.asciidoc[]
-include::release-notes/5.0.0-alpha3.asciidoc[]
-include::release-notes/5.0.0-alpha2.asciidoc[]
-include::release-notes/5.0.0-alpha1.asciidoc[]
-include::release-notes/5.0.0-alpha1-2x.asciidoc[]