fix doxygen brief in subzero header files

src/IceTypes.h

 //===- subzero/src/IceTypes.h - Primitive ICE types -------------*- 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 a few properties of the primitive types allowed in
-/// Subzero. Every Subzero source file is expected to include IceTypes.h.
+/// \brief Declares a few properties of the primitive types allowed in Subzero.
+/// Every Subzero source file is expected to include IceTypes.h.
 ///
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICETYPES_H
 #define SUBZERO_SRC_ICETYPES_H
 
 #include "IceDefs.h"
 #include "IceTypes.def"
 
 namespace Ice {
@@ skipping 140 matching lines @@
 };
 
 inline Ostream &operator<<(Ostream &Stream, const FuncSigType &Sig) {
   Sig.dump(Stream);
   return Stream;
 }
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETYPES_H