fix doxygen brief in subzero header files

src/IceTranslator.h

 //===- subzero/src/IceTranslator.h - ICE to machine code --------*- 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 general driver class for translating ICE to machine
+/// \brief Declares the general driver class for translating ICE to machine
 /// code.
 ///
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICETRANSLATOR_H
 #define SUBZERO_SRC_ICETRANSLATOR_H
 
 #include "IceDefs.h"
 #include "IceGlobalContext.h"
 
@@ skipping 49 matching lines @@
 protected:
   GlobalContext *Ctx;
   uint32_t NextSequenceNumber;
   /// ErrorCode of the translation.
   ErrorCode ErrorStatus;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETRANSLATOR_H