removed trailing whitespace in Doxygen files

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

interface/spinctrl.h

@@ -33,7 +33,7 @@ public:
     /**
         )
         Constructor, creating and showing a spin control.
-        
+
         @param parent
             Parent window. Must not be @NULL.
         @param value
@@ -56,7 +56,7 @@ public:
             Initial value.
         @param name
             Window name.
-        
+
         @see Create()
     */
     wxSpinCtrl();