More informative CHANGELING entry

CHANGELOG

@@ -25,6 +25,7 @@ v 8.10.0 (unreleased)
   - API: Todos !3188 (Robert Schilling)
   - Add "Enabled Git access protocols" to Application Settings
   - Diffs will create button/diff form on demand no on server side
+  - Reduce size of HTML used by diff comment forms
   - Fix user creation with stronger minimum password requirements !4054 (nathan-pmt)
   - PipelinesFinder uses git cache data
   - Check for conflicts with existing Project's wiki path when creating a new project.