[css-box-4] Add changes list

Author: fantasai

css-box-3/Overview.bs

@@ -481,8 +481,23 @@ Borders {#borders}
 	(Additional [=flow-relative=] border longhands
 	are defined in [[css-logical-1]].)
 
-Changes Since CSS Level 2 {#changes}
-=========================
+
+Changes {#changes}
+=======
+
+Recent Changes {#changes-recent}
+--------------
+
+	There have only been minor editorial adjustments
+	since the <a href="https://www.w3.org/TR/css-box-3/">6 April 2023 Recommendation</a>:
+
+	* Adding some subheadings to [[#box-model]] and moving a paragraph accordingly.
+	* Changing “document tree” to “element tree” in the [[#intro]]
+		to align with the terminology used in [[css-display-3]].
+	* Adding the “Logical Property Group” line to the property definition tables.
+
+Changes Since CSS Level 2 {#changes-since-L2}
+-------------------------
 
 	The following changes have been made to this module
 	since <a href="https://www.w3.org/TR/CSS2/box.html">CSS Level 2</a>: