[css-backgrounds-3] Update Changes section

Author: fantasai

css-backgrounds-3/Overview.bs

@@ -2579,6 +2579,8 @@ Changes since the 14 February 2024 Candidate Recommendation Snapshot</h3>
     in the 'background' shorthand.
     (<a href="https://github.com/w3c/csswg-drafts/issues/8496">Issue 8496</a>)
   <li>Specified [=snapped as a border width|rounding of border widths=] to device pixels.
+    (<a href="https://github.com/w3c/csswg-drafts/issues/7434">Issue 7434</a>)
+  <li>Specified interaction of 'border-radius' and per-axis 'overflow' longhands.
     (<a href="https://github.com/w3c/csswg-drafts/issues/5210">Issue 5210</a>)
   <li>Fixed an error in the Computed Value line of 'background-image'.
     (<a href="https://github.com/w3c/csswg-drafts/issues/8604">Issue 8604</a>)