[coreboot] Proposed overhaul of the GRUB2 wiki page

[Robert Millan]

Hi,

I made a draft that I would like to propose as an overhaul of the GRUB2 wiki
page.  I (ab)used the Talk page so that it can be reviewed from there:

http://www.coreboot.org/Talk:GRUB2

Please let me know what you think.

Thanks