added prominent link to pdf manual webpage

git-svn-id: http://svn.osgeo.org/qgis/trunk@13083 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: dassau

doc/index.html

@@ -11,7 +11,8 @@
   <td valign="center">
     <span class="header">Quantum GIS Documentation</span><br>
     <span class="subheader">Version 1.4.0 <i>Enceladus</i></span><br>
-    <span class="warning">Please read this entire document for important information about this release.</span>
+    <span class="warning">Please read this entire document for important information about this release.</span><br>
+    <span class="warning">You find a <a href="http://www.qgis.org/en/documentation/manuals.html">PDF manual of the current version</a> on the QGIS website.</span>
   </td>
 </tr>
 </table>