Update docbook headers.

docs/handbook/unicode/index.docbook

@@ -1,5 +1,5 @@
 <?xml version="1.0" ?>
-<!DOCTYPE book PUBLIC "-//KDE//DTD DocBook XML V4.1-Based Variant V1.0//EN" "dtd/kdex.dtd" [
+<!DOCTYPE book PUBLIC "-//KDE//DTD DocBook XML V4.2-Based Variant V1.1//EN" "dtd/kdex.dtd" [
   <!ENTITY bibletime '<application>BibleTime</application>'>
   <!ENTITY sword '<application>Sword</application>'>
   <!--<!ENTITY % addindex "IGNORE"> -->

docs/howto/unicode/index.docbook

@@ -1,5 +1,5 @@
 <?xml version="1.0" ?>
-<!DOCTYPE book PUBLIC "-//KDE//DTD DocBook XML V4.1-Based Variant V1.0//EN" "dtd/kdex.dtd" [
+<!DOCTYPE book PUBLIC "-//KDE//DTD DocBook XML V4.2-Based Variant V1.1//EN" "dtd/kdex.dtd" [
   <!ENTITY bibletime '<application>BibleTime</application>'>
   <!ENTITY kapp "&bibletimehandbook;">
   <!ENTITY % addindex "IGNORE">