Fix formatting in Kotlin changelog

Author: henrymercer

java/ql/lib/change-notes/released/8.0.0.md

@@ -6,7 +6,7 @@
 
 ### New Features
 
-* Kotlin versions up to 2.3.0\ *x* are now supported.
+* Kotlin versions up to 2.3.0 are now supported.
 
 ### Minor Analysis Improvements