Update CHANGES for PR #9551

Author: tk0miya

CHANGES

@@ -29,6 +29,8 @@ Features added
 * #9961: html: Support nested <kbd> HTML elements in other HTML builders
 * #10013: html: Allow to change the loading method of JS via ``loading_method``
   parameter for :meth:`Sphinx.add_js_file()`
+* #9551: html search: "Hide Search Matches" link removes "highlight" parameter
+  from URL
 * #9815: html theme: Wrap sidebar components in div to allow customizing their
   layout via CSS
 * #9827: i18n: Sort items in glossary by translated terms