Fix example referencing PRs: we don't use the categories for PR numbers
with Bugzilla

PR:		192930
Submitted by:	ngie


git-svn-id: svn+ssh://svn.freebsd.org/doc/head@45528 c2e8774f-c49f-e111-b436-862b2bbc8956
- Merge the following from the English version:

	r33266 -> r33417	head/ja_JP.eucJP/books/handbook/preface/preface.xml


git-svn-id: svn+ssh://svn.freebsd.org/doc/head@45529 c2e8774f-c49f-e111-b436-862b2bbc8956