[css-ruby] Comment out unnecessary section

Author: frivoal

css-ruby-1/Overview.bs

@@ -509,6 +509,11 @@ Unit Pairing and Spanning Annotations</h4>
 
 	Issue: Insert diagram
 
+<!--
+	No longer needed now that the layout model is better defined,
+	althout we might want this (or something like this) if we want to handle
+	complex cases for nesting with proper alignement accross the nested parts
+
 <h4 id="nested-pairing">
 Complex Spanning with Nested Ruby</h4>
 
@@ -532,6 +537,7 @@ Complex Spanning with Nested Ruby</h4>
 	Issue: It's not clear whether this falls out of layout handling of ruby containers inside ruby bases
 	or needs to be handled specially.
 	Waiting until layout is better-defined to find out...
+-->
 
 <h3 id="autohide">
 Autohiding Base-identical Annotations</h3>