[css2] Håkon's edit: 'content' only has a new 'normal' keyword, no new 'none'

keyword (that one isn't needed yet, but will be in CSS3).

--HG--
extra : convert_revision : svn%3A73dc7c4b-06e6-40f3-b4f7-9ed1dbc14bfc/trunk%402101

Author: bert-github

css2/generate.src

@@ -154,11 +154,7 @@ meanings:</p>
 <dl>
 
 <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"><strong>none</strong></span>
-<dd>No content is generated.</dd>
+<dd>The pseudo-element is not generated.</dd>
 
 <dt><span class="index-inst" title="&lt;string&gt;"><span
 class="value-inst-string"><strong>&lt;string&gt;</strong></span></span>