Iterable documentation appears lacking #315
Description
As brought up in this issue comment at the janet repository, what counts as an iterable seems a bit on the vague side.
One idea is to:
provide a definition and perhaps some examples.
One option regarding location is:
it could make sense to add something where indexed, dictionary, and bytes are defined - the data structures page.
Another is:
to modify the looping page and link to it from the aforementioned data structures page.
Perhaps there are even better ideas.
Regarding what counts as an iterable, please see the aforementioned comment for some hints and details.