docs: Note 'Copy results' button in the changelog

Author: claremacrae

docs/What is New/Changelog.md

@@ -12,6 +12,8 @@ _In recent [Tasks releases](https://github.com/obsidian-tasks-group/obsidian-tas
 
 ## 7.x releases
 
+- X.Y.Z:
+  - Add 'Copy results' button: an initial implementation, which is not yet documented.
 - 7.22.0:
   - Fix [[Recurring Tasks#Priority of Dates|priority of dates in recurring tasks]] when using [[Recurring Tasks#Remove scheduled date on recurrence|Remove scheduled date on recurrence]].
   - Update the [[Obsidian Properties#How does Tasks interpret Obsidian Properties?|table of examples]] to show how to use properties with nested data and object serialisation.