fix doxygen brief in subzero header files

src/IceCompileServer.h

 //===- subzero/src/IceCompileServer.h - Compile server ----------*- 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 compile server. Given a compiler implementation, it
-/// dispatches compile requests to the implementation.
+/// \brief Declares the compile server.
+///
+/// Given a compiler implementation, it dispatches compile requests to the
+/// implementation.
 ///
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICECOMPILESERVER_H
 #define SUBZERO_SRC_ICECOMPILESERVER_H
 
 #include "IceCompiler.h"
 #include "IceDefs.h"
 #include "IceGlobalContext.h"
 
@@ skipping 53 matching lines @@
 
 private:
   int argc;
   char **argv;
   std::unique_ptr<GlobalContext> Ctx;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICECOMPILESERVER_H