Update the Gmsh entry in readme.html.

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@@ -427,9 +427,15 @@
              <a href="http://gmsh.info/" target="_top">Gmsh</a></dt>
             <dd>
                 <p>
-                    <a href="http://gmsh.info/" target="_top"></a> is a 3D finite element mesh generator. The executable can be used to create meshes from within deal.II by specifying the relevant input data.
-                    <a href="http://gmsh.info/" target="_top">Gmsh</a> should be readily packaged by most Linux distributions. (Don't forget to install a development version of the library). To use a self compiled version, specify
-                    <code>-DGMSH_DIR=/path/to/gmsh</code> on the command line. Note that netgen, tetgen and blas support has to be enabled in Gmsh.
+                    <a href="http://gmsh.info/" target="_top">Gmsh</a>
+                    is a 3D mesh generator. The executable can be used
+                    to create meshes from within deal.II by specifying
+                    the relevant input data. Gmsh should be readily
+                    packaged by most Linux distributions. To use a
+                    self compiled version,
+                    pass <code>-DGMSH_DIR=/path/to/gmsh</code> to the
+                    deal.II CMake call. Note that netgen, tetgen and
+                    blas support has to be enabled in Gmsh.
                 </p>
             </dd>