chore(gallery-web): update CHANGELOG

Author: samuelreichert

packages/pluggableWidgets/gallery-web/CHANGELOG.md

@@ -8,7 +8,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ### Added
 
-- We added a refresh intervel property, to allow defining an interval (in seconds) for refreshing the content in Gallery
+- We added a refresh interval property, to allow defining an interval (in seconds) for refreshing the content in Gallery
 
 ### Fixed