Merge branch '335970-reduce-the-spacing-of-list-items-for-content-editor' into 'master'

Reduce the spacing of list items for Content Editor

See merge request gitlab-org/gitlab!68612

app/assets/stylesheets/components/content_editor.scss

@@ -2,7 +2,7 @@
   td,
   th,
   li {
-    :only-child {
+    :first-child {
       margin-bottom: 0 !important;
     }
   }