Merge the following from the English version:

1.15 -> 1.22 copyright/freebsd-license.sgml

Submitted by: Hiroki Kobayashi <solidsneak at hyper dot cx>

		Hiroo Ono <hiroo at jp dot FreeBSD dot org>, ryusuke

Reviewed by: Hiroo Ono <hiroo at jp dot FreeBSD dot org>, ryusuke
References: [doc-jp-work 1417,1438]