elaborate on srcfiles a bit

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@923294 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTasks/uptodate.html

@@ -78,8 +78,9 @@ target execution depending on the relative age of the specified files.</p>
 
 <h3>Parameters specified as nested elements</h3>
 <h4><a name="srcfiles">srcfiles</a></h4>
-<p>The nested <code>&lt;srcfiles&gt;</code> element allows you to specify a
-set of files to check against the target file(s).</p>
+<p>The nested <code>&lt;srcfiles&gt;</code> element is a
+<a href="../CoreTypes/fileset.html">fileset</a> and allows you to
+specify a set of files to check against the target file(s).</p>
 
 <p><strong>Note:</strong> You can specify either the <code>srcfile</code>
 attribute or nested <code>&lt;srcfiles&gt;</code> elements, but not both.