fix merge conflict and update CHANGELOG

Author: W0lfbane

addOns/openapi/CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this add-on will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## Unreleased
-
+- Add XML body generation for OpenAPI plugin
 
 ## [47] - 2025-11-04
 ### Changed