[NaCl SDK] Cleanup examples.

native_client_sdk/src/examples/tutorial/debugging/debugging.c

 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
-/** @file hello_world.c
+/** @file debugging.c
  * This example, is a modified version of hello world.  It will start a second
  * thread and cause that thread to crash via a NULL dereference.
  */
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/pp_module.h"
 #include "ppapi/c/pp_var.h"
@@ skipping 258 matching lines @@
     };
     return &messaging_interface;
   }
   return NULL;
 }
 
 /**
  * Called before the plugin module is unloaded.
  */
 PP_EXPORT void PPP_ShutdownModule() {}