Document __FreeBSD_version value 1000717


git-svn-id: svn+ssh://svn.freebsd.org/doc/head@45636 c2e8774f-c49f-e111-b436-862b2bbc8956
Mention Design and Implementation of the FreeBSD Operating
System, 2nd Ed in the bibliography.

Sponsored by:	The FreeBSD Foundation


git-svn-id: svn+ssh://svn.freebsd.org/doc/head@45637 c2e8774f-c49f-e111-b436-862b2bbc8956