Removed comment on being able to add cause methods. This was removed from the API as noted in LANG-584

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@904562 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/commons/lang3/exception/ExceptionUtils.java b/src/main/java/org/apache/commons/lang3/exception/ExceptionUtils.java
index 60afa3b..a34165e 100644
--- a/src/main/java/org/apache/commons/lang3/exception/ExceptionUtils.java
+++ b/src/main/java/org/apache/commons/lang3/exception/ExceptionUtils.java
@@ -103,7 +103,6 @@
      * <p>The method searches for methods with specific names that return a 
      * <code>Throwable</code> object. This will pick up most wrapping exceptions,
      * including those from JDK 1.4.
-     * The method names can be added to using {@link #addCauseMethodName(String)}.</p>
      *
      * <p>The default list searched for are:</p>
      * <ul>