Apply suggestions from code review

Author: leemthompo

docs/reference/migration/migrate_8_16.asciidoc

@@ -9,7 +9,6 @@ your application to {es} 8.16.
 
 See also <<release-highlights>> and <<es-release-notes>>.
 
-coming::[8.16.0]
 
 
 [discrete]

docs/reference/release-notes.asciidoc

@@ -8,7 +8,6 @@ This section summarizes the changes in each release.
 
 * <<release-notes-8.19.0>>
 * <<release-notes-8.18.0>>
-* <<release-notes-8.17.2>>
 * <<release-notes-8.17.1>>
 * <<release-notes-8.17.0>>
 * <<release-notes-8.16.4>>
@@ -87,7 +86,6 @@ This section summarizes the changes in each release.
 
 include::release-notes/8.19.0.asciidoc[]
 include::release-notes/8.18.0.asciidoc[]
-include::release-notes/8.17.2.asciidoc[]
 include::release-notes/8.17.1.asciidoc[]
 include::release-notes/8.17.0.asciidoc[]
 include::release-notes/8.16.4.asciidoc[]