Fix for Maven -833

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@114055 13f79535-47bb-0310-9956-ffa450edef68

multiproject/plugin.jelly

@@ -84,7 +84,7 @@
         needing to be copied
         -->
         <j:set var="fromDir" 
-          value="${reactorProject.getPluginContext('maven-xdoc-plugin').getVariable('maven.docs.dest')}"/>
+          value="${reactorProject.context.getVariable('maven.docs.dest')}"/>
         <copy toDir="${directory}">
           <fileset dir="${fromDir}"/>
         </copy>