fix doxygen brief in subzero header files

src/IceConditionCodesX8664.h

 //===- subzero/src/IceConditionCodesX8664.h - Condition Codes ---*- 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 condition codes for x86-64.
+/// \brief Declares the condition codes for x86-64.
 ///
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICECONDITIONCODESX8664_H
 #define SUBZERO_SRC_ICECONDITIONCODESX8664_H
 
 #include "IceDefs.h"
 #include "IceInstX8664.def"
 
 namespace Ice {
@@ skipping 16 matching lines @@
 #define X(val, emit) val,
     ICEINSTX8664CMPPS_TABLE
 #undef X
         Cmpps_Invalid
   };
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICECONDITIONCODESX8664_H