Sync language/oop5.xml with EN

This fixes the build by including the new documentation

Author: Girgias

language/oop5.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- $Revision$ -->
-<!-- EN-Revision: a9a6224ca97531df0a4e4b9b16b59c3f2baf1b09 Maintainer: hirokawa Status: ready -->
+<!-- EN-Revision: c0fa5077c8862405942d8aac7360c5169558b59b Maintainer: hirokawa Status: ready -->
 <!-- CREDITS: mumumu -->
 
  <chapter xml:id="language.oop5" xmlns="http://docbook.org/ns/docbook">
@@ -51,6 +50,7 @@
   &language.oop5.references;
   &language.oop5.serialization;
   &language.oop5.variance;
+  &language.oop5.lazy-objects;
   &language.oop5.changelog;
 </chapter>