fix: Issue of DataSource subclasses using parent abstract class docstrings by dandawg · Pull Request #4730 · feast-dev/feast
What this PR does / why we need it:
This is a natural continuation of the work done in this PR: [PR](fix: Fixed SparkSource docstrings so it wouldn't used inhereted class docstrings).
There were other DataSource subclasses that had the same issue--using the abstract class docstring (and __init__ docstring, which did not accurately describe the parameters and functionality of the specialized subclasses.
I have added class docstrings and class __init__ docstrings where they were missing for subclasses of the DataSource class.