fix doxygen brief in subzero header files

src/IceConverter.h

 //===- subzero/src/IceConverter.h - Converts LLVM to ICE --------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
-/// This file declares the LLVM to ICE converter.
+/// \brief Declares the LLVM to ICE converter.
 ///
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICECONVERTER_H
 #define SUBZERO_SRC_ICECONVERTER_H
 
 #include "IceDefs.h"
 #include "IceTranslator.h"
 
 namespace llvm {
@@ skipping 44 matching lines @@
   /// Converts globals to ICE, and then machine code.
   void convertGlobals(llvm::Module *Mod);
 
   /// Installs global declarations into GlobalDeclarationMap.
   void installGlobalDeclarations(llvm::Module *Mod);
 };
 
 } // end of namespace ICE.
 
 #endif // SUBZERO_SRC_ICECONVERTER_H