Make h2 orange in the documentation in new docs

With the XSLT stylesheets, most chunk headings are not h2 instead of
formerly h1, so make h2 orange as well to match the previous style.

media/css/docs.css

@@ -185,6 +185,15 @@ h4 a:hover {
   text-decoration: none;
 }
 
+/*
+ * Change color of h2 chunk titles in XSL build.  (In DSSSL build,
+ * these will be h1, which is already handled elsewhere.)
+ */
+.titlepage h2.title,
+.refnamediv h2 {
+  color: #EC5800;
+}
+
 /* Text Styles */
 
 div.sect2,