- Merge the following from the English version:

	r37812 -> r40743	head/ja_JP.eucJP/books/handbook/preface/preface.xml
	r45237 -> r45561	head/ja_JP.eucJP/books/handbook/introduction/chapter.xml


git-svn-id: svn+ssh://svn.freebsd.org/doc/head@45571 c2e8774f-c49f-e111-b436-862b2bbc8956