docs/48101: [patch] Add documentation on the fixit disk

[eadler at FreeBSD.org]

Synopsis: [patch] Add documentation on the fixit disk

State-Changed-From-To: open->closed
State-Changed-By: eadler
State-Changed-When: Thu Nov 1 23:52:54 UTC 2012
State-Changed-Why: 
while this PR should have been committed some time ago, it wasn't, and
for that I'm sorry.  In the meantime though the fixit disk is going away
and is being replaced by the 'shell' option in the new installer.

http://www.freebsd.org/cgi/query-pr.cgi?pr=48101