Issue 22424: Add tooltip to header of Done list

app/assets/javascripts/boards/boards_bundle.js

@@ -81,6 +81,7 @@ $(() => {
 
             if (list.type === 'closed') {
               list.position = Infinity;
+              list.label = { description: 'Shows all closed issues. Moving an issue to this list closes it' };
             }
           });
 

changelogs/unreleased/boards-done-add-tooltip.yml

+---
+title: Add tooltip to header of Done board
+merge_request: 10574
+author: Andy Brown