[css-display-3] Update Changes section

Author: fantasai

css-display-3/Overview.bs

@@ -58,7 +58,7 @@ Introduction</h2>
 	and renders it onto a <a href="https://www.w3.org/TR/CSS2/intro.html#canvas">canvas</a>
 	(such as your screen, a piece of paper, or an audio stream).
 	(Some source documents start from more complex trees,
-	such as the DOM, 
+	such as the DOM,
 	which can have comment nodes
 	and other types of things.
 	For the purposes of CSS,
@@ -1408,6 +1408,25 @@ Acknowledgments</h2>
 <h2 class=no-num id="changes">
 Changes</h2>
 
+	Changes since the <a href="https://www.w3.org/TR/2019/CR-css-display-3-20190711/">11 July 2019 Candidate Recommendation</a>
+	include:
+
+	<ul>
+		<li id="change-containing-block">
+			Merged in additional prose from [[!CSS2]] into the definition of [=containing block=].
+		<li id="change-dom-ignore">
+			Clarified that, for the purpose of CSS, DOM nodes other than elements and text are ignored.
+			<blockquote>
+				<p><ins>(Some source documents start from more complex trees,
+				such as the DOM,
+				which can have comment nodes
+				and other types of things.
+				For the purposes of CSS,
+				all of these additional types of nodes are ignored,
+				as if they didn't exist.)</ins>
+			</blockquote>
+	</ul>
+
 	Changes since the <a href="https://www.w3.org/TR/2018/CR-css-display-3-20180828/">28 August 2018 Candidate Recommendation</a>
 	include: