[css-sizing] Copy some notes into a comment, to evaluate later.

Author: fantasai

css-sizing/Overview.bs

@@ -20,6 +20,13 @@ Ignored Terms: block-level box
 url: http://dev.w3.org/csswg/css2/visuren.html#x3; type: dfn; text: containing block
 </pre>
 
+<!-- Notes on stuff to do... [copy/pasted from etherpad, probably out-of-date, evaluate later]
+  Swap definition of preferred size in for max-content.
+  Define current max-content as super-max-content.
+  Mark an isssue about whether it's a necessary concept;
+  I'm unsure, but I think it will show up in orthogonal flow sizing.
+-->
+
 <h2 id="intro">
 Introduction</h2>