Fix markup error

Author: fantasai

css2-src/issues-lc-2011.html

@@ -762,7 +762,6 @@ <h1>Cascading Style Sheets Level 2 Revision 1 (CSS 2.1) Disposition of Comments<
 Response:   None
 Closed:     Accepted
 </pre>
-<pre class="a" id="issue-284">
 <pre class="a" id="issue-285">
 <a href="http://wiki.csswg.org/spec/css2.1#issue-285">CSS2.1 Issue 285</a>.
 Summary:    Clearance moving things up (revisited)