Fixed some Javadoc bad links
diff --git a/mina-core/src/main/java/org/apache/mina/filter/ssl/SslFilter.java b/mina-core/src/main/java/org/apache/mina/filter/ssl/SslFilter.java
index 412cac9..52ce853 100644
--- a/mina-core/src/main/java/org/apache/mina/filter/ssl/SslFilter.java
+++ b/mina-core/src/main/java/org/apache/mina/filter/ssl/SslFilter.java
@@ -111,7 +111,7 @@
/**
* A session attribute key that makes this filter to emit a
* {@link IoHandler#messageReceived(IoSession, Object)} event with a
- * special message ({@link SslEvent#SECURED} or {@link SslEvent#UNSECURED}).
+ * special message ({@link #SESSION_SECURED} or {@link #SESSION_UNSECURED}).
* This is a marker attribute, which means that you can put whatever as its
* value. ({@link Boolean#TRUE} is preferred.) By default, this filter
* doesn't emit any events related with SSL session flow control.
