Fixed download URL.

Author: pavoljuhas

documentation.shtml

@@ -101,7 +101,7 @@ Th. Proffen and S. J. L. Billinge,
 PDFFIT a program for full profile structural refinement of the atomic pair
 distribution function</a>, <i>J.&nbsp;Appl. Crystallogr.</i>
 <b>32</b>, 572 (1999)
-<a href="doc/pdfgui/Proffen-jac-1999.pdf">
+<a href="doc/pdffit/Proffen-jac-1999.pdf">
   <img src="images/pdficon_small.gif" alt="Proffen-jac-1999.pdf" class=middle>
 </a>
 </li>