Updated checkout description.

mainline/doc/project.html

@@ -509,9 +509,15 @@ along with Metrix++. If not, see <http://www.gnu.org/licenses/>.
 
                 <h4>Source Code Repository</h4>
 
-                <p>Source code is in the Subversion <a
-                href="http://metrixplusplus.svn.sourceforge.net/viewvc/metrixplusplus/mainline/">repository</a>
-                used by the project.</p>
+                <p>Source code is in the Subversion repository <a
+                href="http://metrixplusplus.svn.sourceforge.net/viewvc/metrixplusplus/mainline/">(browse
+                online)</a> used by the project. Corresponding checkout command
+                is the following:</p>
+
+                <p><pre>&gt; svn checkout <a href="https://metrixplusplus.svn.sourceforge.net/svnroot/metrixplusplus/mainline/">https://metrixplusplus.svn.sourceforge.net/svnroot/metrixplusplus/mainline/</a></pre>
+                </p>
+
+                <h4></h4>
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             </tr>
           </tbody>