typo

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@276605 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/develop.html

@@ -210,7 +210,7 @@ the implementation of your Java virtual machine.</p>
 
   <h3><a name="nestedtype">Nested Types</a></h3>
 If your task needs to nest an arbitary type that has been defined
-  using &lt;taskdef&gt; you have two options.
+  using &lt;typedef&gt; you have two options.
   <ol>
     <li><code>public void add(Type type)</code></li>
     <li><code>public void addConfigured(Type type)</code></li>