wxGUI/Map Swipe Tool: fix manual link

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@54209 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/mapswipe/frame.py

@@ -464,7 +464,7 @@ class SwipeMapFrame(DoubleMapFrame):
         return True
 
     def OnHelp(self, event):
-        self._giface.Help(entry = 'wxGUI.MapSwipe')
+        self._giface.Help(entry = 'wxGUI.mapswipe')
 
     def OnCloseWindow(self, event):
         self.GetFirstMap().Clean()