reword changelog

Author: Stephan Dilly

CHANGELOG.md

@@ -8,7 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## Unreleased
 
 ## Added
-- undo-last-commit command under `[U]` key [[@remique](https://github.com/remique)] ([#758](https://github.com/extrawurst/gitui/issues/758))
+- new `undo-last-commit` command [[@remique](https://github.com/remique)] ([#758](https://github.com/extrawurst/gitui/issues/758))
 
 ## Fixed
 - openssl vendoring broken on macos ([#772](https://github.com/extrawurst/gitui/issues/772))