[libxml2] Update to Devhelp index file format version 2

[Nick Wellnhofer <nwellnhof src gnome org>]

commit d6761e706fc5de1f25763d6742864f547940d964
Author: Andre Klapper <a9016009 gmx de>
Date:   Mon Jul 13 11:59:45 2020 +0200

    Update to Devhelp index file format version 2
    
    Fixes #89

 doc/devhelp/libxml2.devhelp | 2 +-
 doc/html/libxml.devhelp     | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/doc/devhelp/libxml2.devhelp b/doc/devhelp/libxml2.devhelp
index 2e8eab3f..51b6f262 100644
--- a/doc/devhelp/libxml2.devhelp
+++ b/doc/devhelp/libxml2.devhelp
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<book xmlns="http://www.devhelp.net/book"; title="libxml2 Reference Manual" link="index.html" author="" 
name="libxml2">
+<book xmlns="http://www.devhelp.net/book"; title="libxml2 Reference Manual" link="index.html" version="2" 
author="" name="libxml2">
   <chapters>
     <sub name="API" link="general.html">
       <sub name="DOCBparser" link="libxml2-DOCBparser.html"/>
diff --git a/doc/html/libxml.devhelp b/doc/html/libxml.devhelp
index 006b4bfe..d26d4d85 100644
--- a/doc/html/libxml.devhelp
+++ b/doc/html/libxml.devhelp
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<book xmlns="http://www.devhelp.net/book"; title="Gnome XML Library Reference Manual " link="index.html" 
author="" name="libxml">
+<book xmlns="http://www.devhelp.net/book"; title="Gnome XML Library Reference Manual " link="index.html" 
version="2" author="" name="libxml">
   <chapters>
     <sub name="Libxml Programming Notes" link="ch01.html">
       <sub name="testOOMlib" link="libxml-testOOMlib.html"/>