Document the minimal supported MPI version

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+Documented: The minimal supported MPI version is MPI-2.0.
+<br>
+(Daniel Arndt, 2019/02/02)

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                 <i>MPI</i>: To enable parallel computations beyond a single node using the <a href="http://mpi-forum.org/" target="_top">Message
          Passing Interface (MPI)</a>, pass the
                 <code>-DDEAL_II_WITH_MPI=ON</code> argument to <code>cmake</code>. If <code>cmake</code> found MPI but you specifically do not want to use it, then pass <code>-DDEAL_II_WITH_MPI=OFF</code>.
+                The minimal supported version is MPI-2.0.
             </p>
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