fix manual entry for erroronmissingdir

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@568518 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTypes/fileset.html

@@ -104,7 +104,10 @@ equivalent to an <code>&lt;and&gt;</code> selector container.</p>
       Specify what happens if the base directory does not exist.
       If true a build error will happen, if false, the fileset
       will be ignored.
-      true.</td>
+      Defaults to true.
+      <em>Since Ant 1.7.1 (default is true for backward compatiblity
+        reasons.)</em>
+    </td>
     <td valign="top" align="center">No</td>
   </tr>
 </table>