Update CHANGELOG.md with compare page autocompletion addition (!24039) · Merge requests · Administrator / sourcegraph · GitLab

Administrator requested to merge tr/compare-page-changelog into main Aug 17, 2021

Created by: umpox

Forgot to add this as part of https://github.com/sourcegraph/sourcegraph/pull/23977 and https://github.com/sourcegraph/sourcegraph/pull/23973