Added comment to calc() linking to minutes discussing mult/div by dimensions.

Author: tabatkins

css3-values/Overview.html

@@ -1324,7 +1324,10 @@ <h3 id=calc><span class=secno>9.1. </span> Mathematical Expressions:
    href="#frequency-value"><code>&lt;frequency&gt;</code></a>, <a
    href="#angle-value"><code>&lt;angle&gt;</code></a>, <a
    href="#time-value"><code>&lt;time&gt;</code></a>, or <a
-   href="#number-value"><code>&lt;number&gt;</code></a> values are allowed.
+   href="#number-value"><code>&lt;number&gt;</code></a> values are allowed.</p>
+  <!-- http://lists.w3.org/Archives/Public/www-style/2010May/0001.html
+	This has notes on how we should handle things when calc() is extended to 
+	handle unit mult/div. -->
 
   <div class=example>
    <pre>

css3-values/Overview.src.html

@@ -885,6 +885,10 @@ <h3 id="calc">
 	<code>&lt;number&gt;</code>
 	values are allowed.</p>
 
+	<!-- http://lists.w3.org/Archives/Public/www-style/2010May/0001.html
+	This has notes on how we should handle things when calc() is extended to 
+	handle unit mult/div. -->
+
 	<div class="example">
 		<pre>
 section {