Fixed typo in spec

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%402539

dlib/gui_widgets/base_widgets_abstract.h

@@ -1148,7 +1148,6 @@ namespace dlib
         /*!
             ensures
                 - The text of this menu item will be str
-                  clicked by the user.
                 - #get_hot_key() == hotkey
         !*/