[Directory Wiki] Trivial Update of "MinaTutorial" by leo

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http://wiki.apache.org/directory/MinaTutorial

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    * sessionClosed: Invoked when the I/O connection is closed.
    * sessionIdle: Invoked when there is no transmission of data between remote peer and user application.
    * exceptionCaught: Invoked when any exceptions are thrown from IoAcceptor or your IoHandler.
-   * dataRead: Invoked when data is read from the remote peer.
-   * dataWritten: Invoked when your write request is written out to the remote peer.
+   * messageReceived: Invoked when protocol message is received.  Implement your protocol flow here.
+   * messageSent: Invoked when protocol message that user requested by IoSession#write(Object) is sent out actually.
  
  We’ll see how to implement IoHandler for echo protocol in the next section.