[css-contain-2] Help bikeshed with cross-linking

Author: frivoal

css-contain-2/Overview.bs

@@ -42,6 +42,7 @@ spec:css-break-3; type:dfn; text:fragmentation
 spec:css-break-3; type:dfn; text:fragmentation container
 spec:css-break-3; type:dfn; text:fragmentation context
 spec:css-break-3; type:dfn; text:fragmented flow
+spec:css-sizing-4; type:property; text:contain-intrinsic-size
 </pre>
 
 <h2 id='intro'>