Add selectors to nested elements of dirset.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@277843 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTypes/dirset.html

@@ -11,7 +11,8 @@
 <h2><a name="dirset">DirSet</a></h2>
 <p>A DirSet is a group of directories. These directories can be found in a
 directory tree starting in a base directory and are matched by
-patterns taken from a number of <a href="patternset.html">PatternSets</a>.
+patterns taken from a number of <a href="patternset.html">PatternSets</a>
+and <a href="selectors.html">Selectors</a>.
 </p>
 <p>PatternSets can be specified as nested
 <code>&lt;patternset&gt;</code> elements. In addition, DirSet holds