fix doxygen brief in subzero header files

src/IceELFObjectWriter.h

 //===- subzero/src/IceELFObjectWriter.h - ELF object writer -----*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
-/// Abstraction for a writer that is responsible for writing an ELF file.
+/// \brief Abstraction for a writer that is responsible for writing an ELF file.
 ///
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICEELFOBJECTWRITER_H
 #define SUBZERO_SRC_ICEELFOBJECTWRITER_H
 
 #include "IceDefs.h"
 #include "IceELFSection.h"
 #include "IceELFStreamer.h"
 #include "IceTypes.h"
@@ skipping 142 matching lines @@
 
   /// Write the ELF file header with the given information about sections.
   template <bool IsELF64>
   void writeELFHeaderInternal(Elf64_Off SectionHeaderOffset,
                               SizeT SectHeaderStrIndex, SizeT NumSections);
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEELFOBJECTWRITER_H