Documentation for iterable properties and method parameters should mention "iterable" instead of "list"

[sbethur]

Description of issue

Some properties and method parameters are designed to work with iterables. e.g.: https://github.com/ni/nimi-python/blob/8540e86f00dc4b7aa9dbf5d905275db7255d9c7b/generated/nidigital/nidigital/session.py#L607

offsets can be any iterable object. But the documentation says:

offsets (list of float in seconds or datetime.timedelta):

We should update the documentation, in all such cases, to say something like "iterable of float in seconds...".