Bug#429576: grub: better whatis description for mkbimage(1)

[Matej Vela]

Package: grub
Version: 0.97-28
Severity: minor

    $ whatis mkbimage
    mkbimage (1)         - manual page for $Id: mkbimage, v 1.10 2002/01/01 15:24:27 tlaronde Exp $

Please use something informative even if it duplicates the description
("make a bootable image using GRUB as a bootloader"); apropos(1) depends
on this.

Thanks,

Matej