Apt -> apt in example

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@277808 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTasks/apt.html

@@ -120,7 +120,7 @@ The inherited "compiler" attribute is ignored, as it is forced to use the Apt co
    <code>&lt;javac&gt;</code> task to compile first your original source code, and then the
    generated source code:</p>
 
-<pre>  &lt;Apt srcdir="${src}"
+<pre>  &lt;apt srcdir="${src}"
          destdir="${build}"
          classpath="xyz.jar"
          debug="true"