clarify the term filterset

Suggested by:	Barrie Treloar <Barrie.Treloar@camtech.com.au>


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@268788 13f79535-47bb-0310-9956-ffa450edef68

docs/ant2/requested-features.txt

@@ -7,6 +7,8 @@ I. Things that don't affect the core but are requests for new tasks or
 enhancements of existing tasks.
 ======================================================================
 
+* Add a new datatype filterset to group token-filters 
+
 * make usage of particular filters/filtersets explicit in copy tasks
 
 * make facade tasks for things like javac (JikesImpl, ModernImpl etc)