fix typo in change note

Co-authored-by: Asger F <asgerf@github.com>

Author: erik-krogh

javascript/ql/lib/change-notes/2022-04-22-xss-library.md

@@ -1,5 +1,5 @@
 ---
 category: deprecated
 ---
-* The `ReflectedXss`, `ReflectedXss`, `StoredXss`, `XssThroughDom`, and `ExceptionXss` modules from `Xss.qll` have been deprecated.  
+* The `ReflectedXss`, `StoredXss`, `XssThroughDom`, and `ExceptionXss` modules from `Xss.qll` have been deprecated.  
   Use the `Customizations.qll` file belonging to the query instead.