Clarify documentation of destdir attribute.

PR: 173


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@269040 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTasks/javadoc.html

@@ -63,7 +63,7 @@ instead.</i></p>
     <td valign="top">destdir</td>
     <td valign="top">Destination directory for output files</td>
     <td align="center" valign="top">all</td>
-    <td align="center" valign="top">Yes</td>
+    <td align="center" valign="top">Yes, unless a doclet has been specified.</td>
   </tr>
   <tr>
     <td valign="top">maxmemory</td>