[css2] Added an ID to the abstract.

--HG--
extra : convert_revision : svn%3A73dc7c4b-06e6-40f3-b4f7-9ed1dbc14bfc/trunk%402174

Author: bert-github

css2/cover.src

@@ -76,7 +76,7 @@
   <hr title="Separator from Header">
 </div>
 
-<h2>Abstract</h2> 
+<h2 id=abstract>Abstract</h2> 
 
 <p>This specification defines Cascading Style Sheets, level&nbsp;2
 revision&nbsp;1 (CSS&nbsp;2.1). CSS&nbsp;2.1 is a style sheet language