Add comment back to changelog section

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@@ -11626,6 +11626,7 @@ <h2>Substantive changes since the last public working draft</h2>
 	<section>
 		<h2>Substantive changes since the <a href="https://www.w3.org/TR/wai-aria-1.1/">WAI-ARIA 1.1 Recommendation</a></h2>
 		<ul>
+			<!-- EdNote: After each WD publish, move contents of the previous list into this one. -->
 			<li>31-May-2018: Add <rref>blockquote</rref>, <rref>caption</rref>, and <rref>paragraph</rref> roles.</li>
 			<li>01-Apr-2018: Added ARIA IDL Section (JavaScript interfaces).</li>
 			<li>06-Dec-2017: Make <sref>aria-expanded</sref> a supported state of <rref>menuitem</rref>. This change also makes it a supported property of <rref>menuitemcheckbox</rref> and <rref>menuitemradio</rref> via inheritance.</li>