[css-fonts-5] Update changes

Author: svgeesus

css-fonts-5/Overview.bs

@@ -710,6 +710,14 @@ Acknowledgments</h2>
 Changes
 </h2>
 
+<h3 id="changes-20210729">Changes since the <a href="https://www.w3.org/TR/2021/WD-css-fonts-5-20210729/">WD of 2021-07-29</a></h3>
+
+<ul>
+	<li>Security and Privacy are now separate sections</li>
+	<li>Fixed font-technology grammar</li>
+	<li>Copied section on parsing src descriptor from CSS Fonts 4</li>
+</ul>
+
 <h3 id="changes-20210629">Changes since the <a href="https://www.w3.org/TR/2021/WD-css-fonts-5-20210629/">FPWD of 2021-06-29</a></h3>
 
 <ul>