[css2] Minor fix

--HG--
extra : convert_revision : svn%3A73dc7c4b-06e6-40f3-b4f7-9ed1dbc14bfc/trunk%401597

Author: ianbjacobs

css2/generate.src

@@ -664,7 +664,7 @@ reset first and then incremented.
 
 <P>The <span class="propinst-counter-reset">'counter-reset'</span>
 property follows the cascading rules. Thus, due to cascading, the
-following stylesheet:</p>
+following style sheet:</p>
 
 <pre class="example">
 H1 { counter-reset: section -1 }