Update example command line.

git-svn-id: https://svn.apache.org/repos/asf/lucene/hadoop/trunk@381795 13f79535-47bb-0310-9956-ffa450edef68

src/java/overview.html

@@ -63,7 +63,7 @@ be demonstrated as follows:</p>
 <tt>
 mkdir input<br>
 cp conf/*.xml input<br>
-bin/hadoop org.apache.hadoop.mapred.demo.Grep input output 'dfs[a-z.]+'<br>
+bin/hadoop jar hadoop-*-examples.jar input output 'dfs[a-z.]+'<br>
 cat output/*
 </tt>
 <p>This will display counts for each match of the <a