message: modify the error diplay in bitcount command
  modify the error diplay in bitcount command
diff: @@ -83,7 +83,7 @@ void BitGetCmd::Do() {
  void BitCountCmd::DoInitial(PikaCmdArgsType &argv, const CmdInfo* const ptr_info) {
  if (!ptr_info->CheckArg(argv.size())) {
  - res_.SetRes(CmdRes::kWrongNum, kCmdNameSet);
  + res_.SetRes(CmdRes::kWrongNum, kCmdNameBitCount);
  return;
  }
  key_ = argv[1];
  