docs/63325: handbook/introduction - added AMD64 and Itanium to processor/platform references

[Josef El-Rayes]

Synopsis: handbook/introduction - added AMD64 and Itanium to processor/platform references

Responsible-Changed-From-To: freebsd-doc->josef
Responsible-Changed-By: josef
Responsible-Changed-When: Wed Feb 25 05:19:29 PST 2004
Responsible-Changed-Why: 
I'll take this one.

http://www.freebsd.org/cgi/query-pr.cgi?pr=63325