The installation document seems to have disappeared from
stable/10 at some point.  Take the installation.html from
10.0R and modify to fit 10.1R.

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation


git-svn-id: svn+ssh://svn.freebsd.org/doc/head@45973 c2e8774f-c49f-e111-b436-862b2bbc8956