[css-backgrounds-4][editorial] Fixed linking errors

Author: SebastianZ

css-backgrounds-4/Overview.bs

@@ -18,7 +18,10 @@ Warning: Not Ready
 <pre class="link-defaults">
 spec:css-text-4; type:value; text:collapse
 spec:css-shapes-2; type:function; text:path()
-spec:css-borders-4; type:property; text:border-color
+spec:css-borders-4;
+	type:property; text:border-color
+	type:property; text:border-style
+	type:property; text:border-width
 </pre>
 
 <link rel="stylesheet" href="style.css" />