[css2] Removed an unused class.

--HG--
extra : convert_revision : svn%3A73dc7c4b-06e6-40f3-b4f7-9ed1dbc14bfc/trunk%401969

Author: bert-github

css2/generate.src

@@ -153,13 +153,11 @@ meanings:</p>
 
 <dl>
 
-<dt><span class="index-inst" title="normal"><span
-class="value-inst-normal"><strong>normal</strong></span></span>
+<dt><span class="index-inst" title="normal"><strong>normal</strong></span>
 <dd>On the :before and :after pseudo-elements, this value is the same
 as 'none'.
 
-<dt><span class="index-inst" title="none"><span
-class="value-inst-none"><strong>none</strong></span></span>
+<dt><span class="index-inst" title="none"><strong>none</strong></span>
 <dd>No content is generated.</dd>
 
 <dt><span class="index-inst" title="&lt;string&gt;"><span