Fix incorrect heading in the changelog file in the maps widget (#224)

Author: leonardomendix

packages/pluggableWidgets/maps-web/CHANGELOG.md

@@ -6,13 +6,13 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased]
 
-## Changed
+### Changed
 
 -   We updated the dependencies
 
 ## [3.1.2] - 2022-04-25
 
-## Changed
+### Changed
 
 -   We changed the Google Maps structure and design previews