Fix pprof VM flag description

runtime/vm/os_linux.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/os.h"
 
 #include <errno.h>
 #include <limits.h>
 #include <malloc.h>
 #include <time.h>
@@ skipping 12 matching lines @@
 
 namespace dart {
 
 // Linux CodeObservers.
 
 DEFINE_FLAG(bool, generate_gdb_symbols, false,
     "Generate symbols of generated dart functions for debugging with GDB");
 DEFINE_FLAG(bool, generate_perf_events_symbols, false,
     "Generate events symbols for profiling with perf");
 DEFINE_FLAG(charp, generate_pprof_symbols, NULL,
-    "Generate events symbols for profiling with pprof");
+    "Writes pprof events symbols to the provided file");
 
 class PerfCodeObserver : public CodeObserver {
  public:
   PerfCodeObserver() {
     Dart_FileOpenCallback file_open = Isolate::file_open_callback();
     if (file_open == NULL) {
       return;
     }
     const char* format = "/tmp/perf-%ld.map";
     intptr_t pid = getpid();
@@ skipping 356 matching lines @@
 void OS::Abort() {
   abort();
 }
 
 
 void OS::Exit(int code) {
   exit(code);
 }
 
 }  // namespace dart