Update CHANGES for PR #9036

Author: tk0miya

CHANGES

@@ -83,6 +83,7 @@ Features added
 * #2018: html: :confval:`html_favicon` and :confval:`html_logo` now accept URL
   for the image
 * #8070: html search: Support searching for 2characters word
+* #9036: html theme: Allow to inherite the search page
 * #8938: imgconverter: Show the error of the command availability check
 * #7830: Add debug logs for change detection of sources and templates
 * #8201: Emit a warning if toctree contains duplicated entries