removed trailing whitespace in Doxygen files

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52634 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/dcmemory.h

@@ -47,7 +47,7 @@ public:
         Also, before using the updated bitmap data, make sure to select it out of
         context first
         (for example by selecting wxNullBitmap into the device context).
-        
+
         @see wxDC::DrawBitmap
     */
     void SelectObject(wxBitmap& bitmap);