[Exim] FAQ updated

I have updated the FAQ and the configuration samples on the (new)
primary ftp site:

ftp://ftp.csx.cam.ac.uk/pub/software/email/exim/FAQ.html.gz
ftp://ftp.csx.cam.ac.uk/pub/software/email/exim/FAQ.txt.gz
ftp://ftp.csx.cam.ac.uk/pub/software/email/exim/config.samples.tar.gz

As with any document, there are likely to be mistakes and typos, so
please let me know if you find any.

-- 
Philip Hazel            University of Cambridge Computing Service,
ph10@???      Cambridge, England. Phone: +44 1223 334714.