fix doxygen brief in subzero header files

src/IceInstX8664.h

 //===- subzero/src/IceInstX8664.h - x86-64 machine instructions -*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
-/// (Note: x86 instructions are templates, and they are defined in
+/// \brief (Note: x86 instructions are templates, and they are defined in
 ///  src/IceInstX86Base.)

[Jim Stichnoth, 2015/12/02 21:50:38]

/// src/
- instead of -
///  src/

[rkotlerimgtec, 2015/12/02 23:58:14]

Done.

 ///
 /// When interacting with the X8664 target (which should only happen in the
 /// X8664 TargetLowering) clients have should use the Ice::X8664::Traits::Insts
 /// traits, which hides all the template verboseness behind a type alias.
 ///
 /// For example, to create an X8664 MOV Instruction, clients should do
 ///
 /// ::Ice::X8664::Traits::Insts::Mov::create
 ///
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICEINSTX8664_H
 #define SUBZERO_SRC_ICEINSTX8664_H
 
 #include "IceDefs.h"
 #include "IceInst.h"
 #include "IceInstX86Base.h"
 #include "IceOperand.h"
 #include "IceTargetLoweringX8664Traits.h"
 
 #endif // SUBZERO_SRC_ICEINSTX8664_H