Add info on original dataset

[chennesy]

How could the content be improved?

Via Lab Editor review:

Datasets used for the lesson - the data used for this lesson is amended from the original (which are presumably open access), but there are currently no details listed on what the originals are and what licence the original was available as.

Which part of the content does your suggestion apply to?

Download the data

[chennesy]

See also:

The ('Download the Data')[https://librarycarpentry.github.io/lc-python-intro/instructor/index.html#download-the-data] section could do with some revision - the final sentence is not particularly unclear.