fix doxygen brief in subzero header files

src/IceInstARM32.cpp

 //===- subzero/src/IceInstARM32.cpp - ARM32 instruction implementation ----===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
-/// This file implements the InstARM32 and OperandARM32 classes, primarily the
+/// \brief Implements the InstARM32 and OperandARM32 classes, primarily the
 /// constructors and the dump()/emit() methods.
 ///
 //===----------------------------------------------------------------------===//
 
 #include "IceInstARM32.h"
 
 #include "IceAssemblerARM32.h"
 #include "IceCfg.h"
 #include "IceCfgNode.h"
 #include "IceInst.h"
@@ skipping 1875 matching lines @@
 template class InstARM32UnaryopFP<InstARM32::Vsqrt>;
 
 template class InstARM32FourAddrGPR<InstARM32::Mla>;
 template class InstARM32FourAddrGPR<InstARM32::Mls>;
 
 template class InstARM32CmpLike<InstARM32::Cmn>;
 template class InstARM32CmpLike<InstARM32::Cmp>;
 template class InstARM32CmpLike<InstARM32::Tst>;
 
 } // end of namespace Ice