Docs - add Mellanox to contributing organizations list.

doc/html/team.shtml

@@ -23,6 +23,7 @@ Lead Slurm developers are:
 <li><a href="http://www.fhcrc.org">Fred Hutchinson Cancer Research Center</a></li>
 <li><a href="http://www.hp.com">HP</a></li>
 <li><a href="http://www.intel.com">Intel</a></li>
+<li><a href="http://www.mellanox.com">Mellanox</a></li>
 <li><a href="http://www.llnl.gov">Lawrence Livermore National Laboratory</a></li>
 <li><a href="http://www.lanl.gov">Los Alamos National Laboratory</a></li>
 <li><a href="http://www.nersc.gov">National Energy Research Scientific