[css-backgrounds-3] Fix computed value line of 'background-image' #8604

Author: fantasai

css-backgrounds-3/Overview.bs

@@ -195,7 +195,7 @@ Initial: none
 Applies to: all elements
 Inherited: no
 Percentages: N/A
-Computed value: computed <<image>>
+Computed value: list, each item either an <<image>> or the keyword ''background-image/none''
 Animation type: discrete
 </pre>
 
@@ -2597,6 +2597,8 @@ Changes since the 14 February 2024 Candidate Recommendation Snapshot</h3>
   <li>Reverted <a href="#bg-color-move">change moving <<color>> to the front of <<final-bg-layer>></a>
     in the 'background' shorthand.
     (<a href="https://github.com/w3c/csswg-drafts/issues/8496">Issue 8496</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>)
 </ul>