Document one omre attribute of changelof.

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git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@272080 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTasks/changelog.html

@@ -28,6 +28,11 @@
     <td valign="top">the file in which to write the changelog.</td>
     <td align="center" valign="top">Yes</td>
   </tr>
+  <tr>
+    <td valign="top">usersfile</td>
+    <td valign="top">property file that contains mapping between userids and display names.</td>
+    <td align="center" valign="top">No</td>
+  </tr>
   <tr>
     <td valign="top">daysinpast</td>
     <td valign="top">sets the start the number of days into the past specified.</td>