Delete old Fill txtview_device_info_buffer comment

Seems to be referring to how Fill_Label_Device_Info() worked in the
past, but from history before the beginning of the GIT repository.
Remove out of date comment.

include/Win_GParted.h

@@ -69,7 +69,6 @@ private:
 	void refresh_combo_devices() ;
 	void show_pulsebar( const Glib::ustring & status_message ) ;
 	void hide_pulsebar();
-	//Fill txtview_device_info_buffer with some information about the selected device
 	void Fill_Label_Device_Info( bool clear = false );
 
 	void Add_Operation( const Device & device, Operation * operation );