Fix sourceforge link

Author: ch4rr0

doc/website/rhsidebar.ssi

@@ -18,7 +18,7 @@
 	</tr>
         <tr>
           <td>
-            <a href="https://sourceforge.net/projects/bowtie-bio/files/bowtie/1.1.2">Bowtie 1.2.1</a>
+            <a href="https://sourceforge.net/projects/bowtie-bio/files/bowtie/1.2.1">Bowtie 1.2.1</a>
           </td>
           <td align="right">
             06/12/17