fix doxygen brief in subzero header files

src/IceClFlags.cpp

 //===- subzero/src/IceClFlags.cpp - Command line flags and parsing --------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
-/// This file defines commandline flags parsing. This currently relies on
-/// llvm::cl to parse. In the future, the minimal build can have a simpler
-/// parser.
+/// \brief Defines commandline flags parsing.
+///
+/// This currently relies on llvm::cl to parse. In the future, the minimal build
+/// can have a simpler parser.
 ///
 //===----------------------------------------------------------------------===//
 
 #include "IceClFlags.h"
 
 #include "IceClFlagsExtra.h"
 
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wunused-parameter"
 #include "llvm/Support/CommandLine.h"
@@ skipping 479 matching lines @@
   OutFlagsExtra.setGenerateBuildAtts(GenerateBuildAtts);
   OutFlagsExtra.setLLVMVerboseErrors(LLVMVerboseErrors);
   OutFlagsExtra.setAppName(AppName);
   OutFlagsExtra.setInputFileFormat(InputFileFormat);
   OutFlagsExtra.setIRFilename(IRFilename);
   OutFlagsExtra.setLogFilename(LogFilename);
   OutFlagsExtra.setOutputFilename(OutputFilename);
 }
 
 } // end of namespace Ice