[css-box-4] Update changes list

Author: fantasai

css-box-4/Overview.bs

@@ -619,6 +619,12 @@ Borders {#borders}
 Recent Changes {#changes}
 ==============
 
+	Changes since the <a href="https://www.w3.org/TR/2024/WD-css-box-4-20240401/">1 April 2024 Working Draft</a> include:
+	* Allowing combining the ''margin-trim/block'' and ''margin-trim/inline'' keywords of 'margin-trim'.
+		(<a href="https://github.com/w3c/csswg-drafts/issues/7884">Issue 7884</a>)
+	* Introducing the [=shaped edge=] and [=unshaped edge=] terms for easier cross-referencing of those concepts.
+		(<a href="https://github.com/w3c/csswg-drafts/issues/5132">Issue 5132</a>)
+
 	Changes since the <a href="https://www.w3.org/TR/2022/WD-css-box-4-20221103/">3 November 2022 Working Draft</a> include:
 	* Removing the effect of 'margin-trim' on floats,
 		because there are use cases for both trimming and not trimming their margins,