Add details re: Kanban (#12721)

Author: techknowlogick

docs/content/doc/features/comparison.en-us.md

@@ -84,7 +84,7 @@ _Symbols used in table:_
 | Comment reactions | ✓ | ✘ | ✓ | ✓ | ✓ | ✘ | ✘ |
 | Lock Discussion | ✓ | ✘ | ✓ | ✓ | ✓ | ✘ | ✘ |
 | Batch issue handling | ✓ | ✘ | ✓ | ✓ | ✓ | ✘ | ✘ |
-| Issue Boards | [✓](https://github.com/go-gitea/gitea/pull/8346) | ✘ | ✘ | ✓ | ✓ | ✘ | ✘ |
+| Issue Boards (Kanban) | [✓](https://github.com/go-gitea/gitea/pull/8346) | ✘ | ✘ | ✓ | ✓ | ✘ | ✘ |
 | Create new branches from issues | ✘ | ✘ | ✘ | ✓ | ✓ | ✘ | ✘ |
 | Issue search | ✓ | ✘ | ✓ | ✓ | ✓ | ✓ | ✘ |
 | Global issue search | [✘](https://github.com/go-gitea/gitea/issues/2434) | ✘ | ✓ | ✓ | ✓ | ✓ | ✘ |