[css-color-4][editorial] link cleanup

Author: svgeesus

css-color-4/Overview.bs

@@ -28,11 +28,13 @@ WPT Display: open
 
 <pre class="link-defaults">
 spec: css22; type: dfn; text: stacking context
-spec: css-borders-4; type: property; text: border-color
-spec: css-borders-4; type: property; text: border-top-color
-spec: css-borders-4; type: property; text: border-left-color
-spec: css-borders-4; type: property; text: border-bottom-color
-spec: css-borders-4; type: property; text: border-right-color
+spec: css-backgrounds-3; type: property; text: background
+spec: css-backgrounds-3; type: property; text: background-color
+spec: css-backgrounds-3; type: property; text: border-color
+spec: css-backgrounds-3; type: property; text: border-top-color
+spec: css-backgrounds-3; type: property; text: border-left-color
+spec: css-backgrounds-3; type: property; text: border-bottom-color
+spec: css-backgrounds-3; type: property; text: border-right-color
 </pre>
 
 
@@ -4948,7 +4950,7 @@ Interpolating with Alpha</h3>
 	</wpt>
 
 
-	<details class=note id=premultiplied>
+	<details class=note id=premultiplied-explainer>
 		<summary>Why is premultiplied alpha useful?</summary>
 
 		<!-- A “pre-multiplied” color