add a caveat concerning jython.jar

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@276822 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/install.html

@@ -356,7 +356,9 @@ you need jakarta-oro 2.0.1 or later, and <a href="#commons-net">commons-net</a><
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   <tr>
     <td>jython.jar</td>
-    <td>Python with script task</td>
+    <td>Python with script task<br>
+    Warning : jython.jar also contains classes from jakarta-oro.
+    Remove these classes if you are also using jakarta-oro.</td>
     <td><a href="http://jython.sourceforge.net/" target="_top">http://jython.sourceforge.net/</a></td>
   </tr>
   <tr>