Add cloze note to editor release notes

docs/release-notes-editor.txt

@@ -11,6 +11,8 @@ Editor
    can be set afterwards. When an option has both a text and an image, the
    text is ignored and the image is shown.
  - Improve ID-Service to free up IDs when elements are deleted
+ - Improve cloze element all around - most importantly allowing to manually
+   size sub-elements
 
 1.12.0
  - Add new element cloze ("Lückentext")