[DOCS] Fix bad xref (#58150)

Author: debadair

docs/reference/release-notes/highlights.asciidoc

@@ -14,7 +14,7 @@ endif::[]
 Other versions: 
 {ref-bare}/7.8/release-highlights.html[7.8] 
 | {ref-bare}/7.7/release-highlights.html[7.7]
-| {ref-bare}/7.7/release-highlights-7.6.0.html[7.6]
+| {ref-bare}/7.6/release-highlights-7.6.0.html[7.6]
 | {ref-bare}/7.5/release-highlights-7.5.0.html[7.5]
 | {ref-bare}/7.4/release-highlights-7.4.0.html[7.4]
 | {ref-bare}/7.3/release-highlights-7.3.0.html[7.3]