document fix of 43574

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@806445 13f79535-47bb-0310-9956-ffa450edef68

WHATSNEW

@@ -447,6 +447,10 @@ Fixed bugs:
    attributes of the last merged manifest.
    Bugzilla Report 39655.
 
+ * <delete> didn't work correctly with a <modified> selector because
+   it was scanning the same filesets more than once.
+   Bugzilla Report 43574.
+
 Other changes:
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  * The get task now also follows redirects from http to https