corrected (Do)GetWriteBuf() return types to use more appropriate type (no real difference)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45625 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/string.h

@@ -1512,7 +1512,7 @@ public:
     //
     // get writable buffer of at least nLen bytes. Unget() *must* be called
     // a.s.a.p. to put string back in a reasonable state!
-  wxDEPRECATED( wxChar *GetWriteBuf(size_t nLen) );
+  wxDEPRECATED( wxStringCharType *GetWriteBuf(size_t nLen) );
     // call this immediately after GetWriteBuf() has been used
   wxDEPRECATED( void UngetWriteBuf() );
   wxDEPRECATED( void UngetWriteBuf(size_t nLen) );