DOC note change to sharedraftcontent markup (#839)

Author: GuySartorelli

en/08_Changelogs/6.2.0.md

@@ -53,6 +53,10 @@ Sortable headers on a grid field and asset-admin table view now include `aria-so
 - The `ins.jstree-icon` elements now have `tabindex="0"` so they can receive keyboard focus.
 - The "Go to previous record" and "Go to next record" buttons in a GridField detail form, when disabled, have changed from a `span` element to an `a` element with an `aria-disabled="true"` attribute.
 
+#### Changes to HTML and CSS elsewhere
+
+- In the `silverstripe/sharedraftcontent` module, the markup for the message on the front-end has changed to use `<details>` and `<summary>` elements for the expand/collapse functionality and a `<dl>` list instead of a `<ul>` list.
+
 #### Changes to usage of `font-icon-*` CSS classes
 
 The `font-icon-*` CSS classes are used to add icons through the CMS use a font to render normal characters as icons.