MacOSX/Framework/VLCEventManager.m: Fix a bit the file description.

extras/MacOSX/Framework/Sources/VLCEventManager.m

 /*****************************************************************************
- * VLCTime.h: VLC.framework VLCTime implementation
+ * VLCEventManager.h: VLC.framework VLCEventManager implementation
+ * This is used to communicate in a sound way accross threads.
  *****************************************************************************
  * Copyright (C) 2007 Pierre d'Herbemont
  * Copyright (C) 2007 the VideoLAN team