Fix example usage of preprocessed internet traffic dataset

[leon-w]

Looking at the the code

def format_data_wports(data_x, n_examples):
    data_ip = decimal2binary(data_x[:n_examples, np.arange(8)])
    data_proto = data_x[:n_examples, 8].reshape(-1, 1)
    data_srcport = uint16_to_binary(data_x[:n_examples, 9].reshape(-1, 1))
    data_dstport = uint16_to_binary(data_x[:n_examples, 10].reshape(-1, 1))
    return np.concatenate((data_ip, data_srcport, data_dstport, data_proto), axis=1)

it seems like the order described in the example python code in the README switched port and protocol type.

This pull request adds the correct field order description to the README.