document newenvironment attribute of apply.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@268913 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTasks/apply.html

@@ -65,6 +65,12 @@ one mapper element are required.</p>
       returncode other than 0.</td>
     <td align="center" valign="top">No</td>
   </tr>
+  <tr>
+    <td valign="top">newenvironment</td>
+    <td valign="top">Do not propagate old environment when new environment
+      variables are specified.</td>
+    <td align="center" valign="top">No, default is <i>false</i></td>
+  </tr>
   <tr>
     <td valign="top">parallel</td>
     <td valign="top">Run the command only once, appending all files as