#23578 - added doc of file attribute

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@275413 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTypes/fileset.html

@@ -35,7 +35,11 @@ equivalent to an <code>&lt;and&gt;</code> selector container.</p>
   <tr>
     <td valign="top">dir</td>
     <td valign="top">the root of the directory tree of this FileSet.</td>
-    <td valign="top" align="center">Yes</td>
+    <td valign="middle" align="center" rowspan="2">Either dir or file must be specified</td>
+  </tr>
+  <tr>
+    <td valign="top">file</td>
+    <td valign="top">shortcut for specifying a single file fileset</td>
   </tr>
   <tr>
     <td valign="top">defaultexcludes</td>