enhance copy filtering docs. PR 16848

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@805364 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTasks/copy.html

@@ -91,8 +91,8 @@ operation as <a href="../CoreTypes/filterset.html">filtersets</a>.
   </tr>
   <tr>
     <td valign="top">filtering</td>
-    <td valign="top">Indicates whether token filtering using the global
-      build-file filters should take place during the copy.
+    <td valign="top">Indicates whether token filtering using the <a href="../using.html#filters">global
+        build-file filters</a> should take place during the copy.
       <em>Note</em>: Nested <code>&lt;filterset&gt;</code> elements will
       always be used, even if this attribute is not specified, or its value is
       <code>false</code> (<code>no</code>, or <code>off</code>).</td>
@@ -192,6 +192,8 @@ be used.</p>
 tokens in files that are copied.
  To use a FilterSet, use the nested <code>&lt;filterset&gt;</code> element.</p>
 
+<p>It is possible to use more than one filterset.</p>
+
 <h4>filterchain</h4>
 <p>The Copy task supports nested <a href="../CoreTypes/filterchain.html">
 FilterChain</a>s.</p>