[DOCS] Remove 8.8 release highlights link to fix docs build (#95578)

docs/reference/release-notes/highlights.asciidoc

@@ -12,8 +12,8 @@ endif::[]
 // Add previous release to the list
 Other versions:
 
-{ref-bare}/8.8/release-highlights.html[8.8]
-| {ref-bare}/8.7/release-highlights.html[8.7]
+//{ref-bare}/8.8/release-highlights.html[8.8]
+{ref-bare}/8.7/release-highlights.html[8.7]
 | {ref-bare}/8.6/release-highlights.html[8.6]
 | {ref-bare}/8.5/release-highlights.html[8.5]
 | {ref-bare}/8.4/release-highlights.html[8.4]