wxGUI/manual: fix html tag

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@46009 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/docs/wxGUI.html

@@ -589,7 +589,7 @@ wxGUI Tutorial</a>.
 Michael Barton, Arizona State University, USA<br>
 Daniel Calvelo Aros<br>
 Jachym Cepicky<br>
-Markus Metz, Germany<br<br>
+Markus Metz, Germany<br><br>
 
 Icons created by <a href="http://robert.szczepanek.pl">Robert Szczepanek</a>, Poland (<a href="https://svn.osgeo.org/osgeo/graphics/trunk/toolbar-icons/24x24/">SVN</a>)