Document __FreeBSD_version values: 1100040, 1001501,
903505, 804506

Sponsored by:	The FreeBSD Foundation


git-svn-id: svn+ssh://svn.freebsd.org/doc/head@45858 c2e8774f-c49f-e111-b436-862b2bbc8956
Regenerate after r273433.

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


git-svn-id: svn+ssh://svn.freebsd.org/doc/head@45859 c2e8774f-c49f-e111-b436-862b2bbc8956