[DOCS] Update migrate_8_17.asciidoc (elastic#118830)

Remove "coming" tags

Author: leemthompo

docs/reference/migration/migrate_8_17.asciidoc

@@ -9,9 +9,6 @@ your application to {es} 8.17.
 
 See also <<release-highlights>> and <<es-release-notes>>.
 
-coming::[8.17.0]
-
-
 [discrete]
 [[breaking-changes-8.17]]
 === Breaking changes