fix a typo equivalent not euqivalent

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@274519 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/CoreTypes/fileset.html

@@ -25,7 +25,7 @@ attributes.</p>
 <p>Selectors are available as nested elements.within the FileSet.
 If any of the selectors within the FileSet do not select the file, the
 file is not considered part of the FileSet. This makes FileSets
-euqivalent to an <code>&lt;and&gt;</code> selector container.</p>
+equivalent to an <code>&lt;and&gt;</code> selector container.</p>
 <table border="1" cellpadding="2" cellspacing="0">
   <tr>
     <td valign="top"><b>Attribute</b></td>