Fixing method and variable name typos. Resolves ZF-7236.

git-svn-id: http://framework.zend.com/svn/framework/standard/trunk@18739 44c647ce-9c0f-0410-b52a-842ac1e357ba

documentation/manual/en/module_specs/Zend_Search_Lucene-Extending.xml

@@ -238,7 +238,7 @@ Zend_Search_Lucene_Analysis_Analyzer::setDefault($analyzer);
         </para>
 
         <para>
-            idf(t) - <methodname>Zend_Search_Lucene_Search_Similarity::tf($term, $reader)</methodname> - a score factor for a simple term with the specified index.
+            idf(t) - <methodname>Zend_Search_Lucene_Search_Similarity::idf($input, $reader)</methodname> - a score factor for a simple term with the specified index.
         </para>
 
         <para>