[clutter] docs: Fix up the main reference XML

[Emmanuele Bassi <ebassi src gnome org>]

commit 6c26f791c257e56479a8ada9b68159425659e1f5
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Sep 22 00:58:13 2015 +0100

    docs: Fix up the main reference XML
    
    We need an updated Docbook schema, and a couple of other attributes, so
    that gtk-doc will generate a valid devhelp file.

 doc/reference/clutter-docs.xml.in |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/doc/reference/clutter-docs.xml.in b/doc/reference/clutter-docs.xml.in
index 28095ca..a4b8235 100644
--- a/doc/reference/clutter-docs.xml.in
+++ b/doc/reference/clutter-docs.xml.in
@@ -1,10 +1,10 @@
-<?xml version="1.0"?>
-<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
-               "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"; [
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+               "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"; [
 <!ENTITY version "@VERSION@">
 ]>
 
-<book id="index" xmlns:xi="http://www.w3.org/2003/XInclude";>
+<book id="clutter" lang="en" xmlns:xi="http://www.w3.org/2003/XInclude";>
   <bookinfo>
     <title>Clutter Reference Manual</title>
     <releaseinfo>for Clutter &version;</releaseinfo>