use correct dash character in the documentation

doc/index.html

@@ -630,11 +630,11 @@
     </li>
     <li>
         <a href="http://www.sandroid.org/imcross/">IMCROSS</a>
-        - another project with a similar goal
+        &#x2013; another project with a similar goal
     </li>
     <li>
         <a href="http://thebeezspeaks.blogspot.com/2009/04/cross-compilers-new-wave.html">Cross compilers, the new wave</a>
-        - an article which appeared on
+        &#x2013; an article which appeared on
         <a href="http://lxer.com/module/newswire/view/118868">LXer</a>
         and
         <a href="http://www.linuxtoday.com/developer/2009041501335RVSWDV">Linux Today</a>