fix typo (reported by Antony Goubard)

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@449828 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/condition/Contains.java

@@ -51,7 +51,7 @@ public class Contains implements Condition {
 
     /**
      * Whether to search ignoring case or not.
-     * @param b if true, ignore case
+     * @param b if false, ignore case
      * @since Ant 1.5
      */
     public void setCasesensitive(boolean b) {