[coreboot] Call for coreboot wiki updates

[Marc Jones]

Hi corebooters!

We have started to notice that some of the wiki articles have become
out of date (v4, build/kconfig, seabios, libpayload, hardware support,
etc). This has been a challenge for potential GSoC students and other
developers that are new coreboot.

If you have a little time and want to help the coreboot project,
please update the wiki to reflect the current state of coreboot
development.

Thanks!
Marc