wxGUI/mapswipe: update manual

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@58198 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/mapswipe/g.gui.mapswipe.html

@@ -15,6 +15,8 @@ Map Swipe allows you to:
   <li>switch orientation of the swipe line (horizontal or vertical)</li>
   <li>zooming, panning</li>
   <li>automatically load maps when opening Map Swipe with two selected raster maps in Layer Manager</li>
+  <li>compare 2 raster maps or load different combinations of raster
+      and vector maps and set transparency (advanced mode)</li>
   <li>save display to graphics file</li>
   <li>display text labels with map names</li>
   <li>choose between 'swipe' mode (default) and 'mirror' mode (synchronized maps displayed side by side) </li>