Mentions changes of summary documents in CHANGELOG:

(gitkraken#4328, gitkraken#4489)

Author: sergeibbb

CHANGELOG.md

@@ -19,6 +19,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 ### Changed
 
 - Changes branch favoriting to apply to both local and remote branch pairs ([#4497](https://github.com/gitkraken/vscode-gitlens/issues/4497))
+- Supports opening an explain summary document before summary content is generated ([#4328](https://github.com/gitkraken/vscode-gitlens/issues/4328))
 
 ## [17.3.3] - 2025-07-28