Mention the contributors. (Drop my email address here as it's awkward
to format otherwsixse.)
Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
<book>
<title>User service daemon and client specification
-<author>Ian Jackson <email>ijackson.greenend.org.uk
+<author>Ian Jackson and contributors
<version>1.2.1~beta2</version>
<abstract>
<book>
<title>User service daemon and client specification
-<author>Ian Jackson <email>ijackson.greenend.org.uk
+<author>Ian Jackson and contributors
<version></version>
<abstract>