Update stylesheet.appdata.xml.in

Author: danirabbit

data/stylesheet.appdata.xml.in

@@ -24,6 +24,12 @@
 
   <releases>
     <release version="8.2.2" date="2025-07-07" urgency="medium">
+      <description>
+        <p>Improve support for LibAdwaita widgets:</p>
+        <ul>
+          <li>Add Adw.NavigationSplitView styles</li>
+        </ul>
+      </description>
       <issues>
         <issue url="https://github.com/elementary/stylesheet/issues/1244">The primary text in Granite.HeaderLabel misaligned when placed in Gtk.Popover</issue>
       </issues>