doc: fix bad merge duplicating header in changelog

Author: isc-pbarton

CHANGELOG.md

@@ -18,8 +18,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Popping from stash is more responsive (#687, #747)
 - Favorites links for Git pages now works on recent IRIS versions (#734)
 - IDE editing of decomposed productions now properly handles adds and deletes (#643)
-
-### Fixed
 - Fixed error running Import All when Git settings file does not exist (#713)
 
 ## [2.10.0] - 2025-02-10