Add dbaron's message about specificity as issue

Author: fantasai

selectors4/Overview.html

@@ -2416,6 +2416,11 @@ <h2 id=specificity><span class=secno>9. </span> Calculating a selector's
    specific argument. The pseudo-class itself does not count as pseudo-class.
 
 
+  <p class=issue>It would probably be better to have match-sensitive
+   specificity, if possible. See <a
+   href="http://lists.w3.org/Archives/Public/www-style/2010Sep/0534.html">dbaron's
+   message</a>.
+
   <p>Concatenating the three numbers a-b-c (in a number system with a large
    base) gives the specificity.
 

selectors4/Overview.src.html

@@ -1931,6 +1931,9 @@ <h2 id=specificity>
   of its most specific argument. The pseudo-class itself does not
   count as pseudo-class.
 
+  <p class="issue">It would probably be better to have match-sensitive
+    specificity, if possible. See <a href="http://lists.w3.org/Archives/Public/www-style/2010Sep/0534.html">dbaron's message</a>.
+
   <p>Concatenating the three numbers a-b-c (in a number system with a
   large base) gives the specificity.</p>