fix error in sample code

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@379780 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTypes/filterchain.html

@@ -1350,11 +1350,13 @@ copying text files:
     <pre>
 &lt;copy todir="dist"&gt;
   &lt;fileset dir="src" includes="**/*.txt"/&gt;
-  &lt;scriptfilter language="beanshell"&gt;
-      if (self.getToken().indexOf("bad") != -1) {
-          self.setToken(null);
-      }
-  &lt;/scriptfilter&gt;
+  &lt;filterchain&gt;
+    &lt;scriptfilter language="beanshell"&gt;
+        if (self.getToken().indexOf("bad") != -1) {
+            self.setToken(null);
+        }
+    &lt;/scriptfilter&gt;
+  &lt;/filterchain&gt;
 &lt;/copy&gt;
     </pre>
   </blockquote>
@@ -1400,4 +1402,4 @@ This may be used as follows:
 <hr>
 
 <p align=center>Copyright &copy; 2002-2006 The Apache Software Foundation. All rights
-Reserved.</p></body></html>
+Reserved.</p></body></html>