doxygen fix

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@35886 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/wxpythonlib.dox

@@ -1,4 +1,4 @@
-/*! \page WXGRASS_PYTHON GRASS wxpython based graphical user interface
+/*! \mainpage WXGRASS_PYTHON GRASS wxpython based graphical user interface
 
 <h2>GRASS wxpython based graphical user interface</h2>