Update docs for GtkEntry::activate
Update docs for GtkEntry::activate

Remove the 'you shall not connect' message from this signal.
While it is a keybinding signal, using it from applications is
fine and, in fact, expected.

johne53/MB3Gtk-2,Distrotech/gtk,johne53/MB3Gtk-2,Distrotech/gtk,johne53/MB3Gtk-2,johne53/MB3Gtk-2,johne53/MB3Gtk-2,Distrotech/gtk,Distrotech/gtk,Distrotech/gtk