[DOCS] Restores 6.4.0 release notes and highlights

Author: lcawl

docs/reference/index-shared4.asciidoc

@@ -4,3 +4,7 @@ include::how-to.asciidoc[]
 include::testing.asciidoc[]
 
 include::glossary.asciidoc[]
+
+include::release-notes/highlights.asciidoc[]
+
+include::release-notes.asciidoc[]

docs/reference/release-notes.asciidoc

@@ -5,6 +5,9 @@
 --
 This section summarizes the changes in each release.
 
+* <<release-notes-6.4.0>>
+* <<release-notes-6.3.1>>
+* <<release-notes-6.3.0>>
 * <<release-notes-6.2.4>>
 * <<release-notes-6.2.3>>
 * <<release-notes-6.2.2>>
@@ -17,24 +20,14 @@ This section summarizes the changes in each release.
 * <<release-notes-6.1.0>>
 * <<release-notes-6.0.1>>
 * <<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/6.2.4.asciidoc[]
-include::release-notes/6.2.3.asciidoc[]
-include::release-notes/6.2.2.asciidoc[]
-include::release-notes/6.2.1.asciidoc[]
-include::release-notes/6.2.0.asciidoc[]
-include::release-notes/6.1.4.asciidoc[]
-include::release-notes/6.1.3.asciidoc[]
-include::release-notes/6.1.2.asciidoc[]
-include::release-notes/6.1.1.asciidoc[]
-include::release-notes/6.1.0.asciidoc[]
-include::release-notes/6.0.1.asciidoc[]
-include::release-notes/6.0.0.asciidoc[]
-include::release-notes/6.0.0-rc2.asciidoc[]
-include::release-notes/6.0.0-rc1.asciidoc[]
-include::release-notes/6.0.0-beta2.asciidoc[]
-include::release-notes/6.0.0-beta1.asciidoc[]
-include::release-notes/6.0.0-alpha2.asciidoc[]
-include::release-notes/6.0.0-alpha1.asciidoc[]
-include::release-notes/6.0.0-alpha1-5x.asciidoc[]
+
+include::release-notes/6.4.0.asciidoc[]