Comment and white-space cleanup in IO libraries.

runtime/bin/output_stream.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Output streams are used to write data sequentially to a data
  * destination e.g. a connected socket or an open file.
  *
  * An output stream provides internal buffering of the data written
  * through all calls to [write] and [writeFrom] if data cannot be
@@ skipping 43 matching lines @@
   void destroy();
 
   /**
    * Sets the handler that gets called when the internal OS buffers
    * have been flushed. This callback can be used to keep the rate of
    * writing in sync with the rate the system can write data to the
    * underlying communication channel.
    */
   void set noPendingWriteHandler(void callback());
 
-  /*
+  /**
    * Sets the handler that gets called when the underlying
    * communication channel has been closed and no more data can be
    * send.
    */
   void set closeHandler(void callback());
 
   /**
    * Sets the handler that gets called when the underlying
    * communication channel gets into some kind of error situation.
    */
   void set errorHandler(void callback());
 }