[css-scroll-anchoring-1] Fix link-defaults for content-area and css2 properties

Author: eqrion

css-scroll-anchoring-1/Overview.bs

@@ -18,7 +18,8 @@ Abstract: This spec also proposes an API for web developers to opt-out of this b
 </pre>
 
 <pre class=link-defaults>
-spec:css22;
+spec:css-box-3; type:dfn; text:content area
+spec:css2;
 	type:property;
 		text:max-height
 		text:min-height