correct taskname in example

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@269899 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTasks/antjar.html

@@ -69,7 +69,7 @@ as the SystemId for the document.
 <h3>Nested elements</h3>
 See the nested elements of the <a href="jar.html">Jar task</a>.
 <h3>Examples</h3>
-<pre>  &lt;jar file=&quot;${dist}/lib/app.jar&quot; 
+<pre>  &lt;antjar file=&quot;${dist}/lib/app.jar&quot; 
        antxml=&quot;${src}/applib.xml&quot; basedir=&quot;${build}/classes&quot;/&gt;</pre>
 <p>jars all files in the <code>${build}/classes</code> directory into a file
 called <code>app.jar</code> in the <code>${dist}/lib</code> directory and