Removed note about flexible margins in the main axis.

Author: tabatkins

css3-flexbox/Overview.html

@@ -1293,18 +1293,6 @@ <h3 id=flex-pack><span class=secno>5.1. </span> Main Axis Alignment: the
     keywords and their effects on a flexbox with three colored items.</p>
   </div>
 
-  <p class=note>A previous revision of this spec allowed margins to flex
-   directly, which allowed an effect similar to &lsquo;<a
-   href="#flex-pack0"><code class=property>flex-pack</code></a>&rsquo;. In
-   particular, it allowed an author to, for example, split a flexbox in half,
-   with some of the items pushed toward the start and the rest pushed toward
-   the end, by flexing exactly one margin. This sort of effect is no longer
-   possible without either using the ::before or ::after pseudoelements or
-   adding additional elements to the document, to act as an empty item that
-   can then flex. It's expected that we will develop something in the future
-   to make this easier, such as a more general pseudoelement or perhaps the
-   ability to explicitly control individual spaces between flexbox items.
-
   <h3 id=flex-align><span class=secno>5.2. </span> Cross Axis Alignment: the
    &lsquo;<a href="#flex-align0"><code
    class=property>flex-align</code></a>&rsquo; and &lsquo;<a