fix doxygen brief in subzero header files

src/IceELFObjectWriter.cpp

 //===- subzero/src/IceELFObjectWriter.cpp - ELF object file writer --------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
-/// This file defines the writer for ELF relocatable object files.
+/// \brief Defines the writer for ELF relocatable object files.
 ///
 //===----------------------------------------------------------------------===//
 
 #include "IceELFObjectWriter.h"
 
 #include "IceAssembler.h"
 #include "IceDefs.h"
 #include "IceELFSection.h"
 #include "IceELFStreamer.h"
 #include "IceGlobalContext.h"
@@ skipping 647 matching lines @@
   if (ELF64) {
     writeELFHeaderInternal<true>(ShOffset, ShStrTab->getNumber(),
                                  AllSections.size());
   } else {
     writeELFHeaderInternal<false>(ShOffset, ShStrTab->getNumber(),
                                   AllSections.size());
   }
 }
 
 } // end of namespace Ice