code: @Override
      public DescribeBudgetResult describeBudget(DescribeBudgetRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeBudget(request);
      }
docs: <p>
  Describes a budget.
  </p>
  
  @param describeBudgetRequest
  Request of DescribeBudget
  @return Result of the DescribeBudget operation returned by the service.
  @throws InternalErrorException
  An error on the server occurred during the processing of your request. Try again later.
  @throws InvalidParameterException
  An error on the client occurred. Typically, the cause is an invalid input value.
  @throws NotFoundException
  We can’t locate the resource that you specified.
  @sample AWSBudgets.DescribeBudget