[DOCS] Update migrate_8_16.asciidoc (#118831)

Remove "coming" tags

docs/reference/migration/migrate_8_16.asciidoc

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