Update reference/libxml/libxmlerror.xml

Co-authored-by: Gina Peter Banyard <[email protected]>

Author: kocsismate

reference/libxml/libxmlerror.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- $Revision$ -->
-<phpdoc:classref xml:id="class.libxmlerror" xmlns:phpdoc="http://php.net/ns/phpdoc" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude">
+<phpdoc:classref xml:id="class.libxmlerror" xmlns:phpdoc="http://php.net/ns/phpdoc" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
  <title>The LibXMLError class</title>
  <titleabbrev>LibXMLError</titleabbrev>