Missing APIs for SageMaker Feature Store

[juliensimon]

While working on Feature Store, I noticed that many APIs are missing in the SageMaker SDK documentation at https://sagemaker.readthedocs.io/en/stable/api/prep_data/feature_store.html

Specifically, this page only lists classes, but none of their methods, e.g. ingest(), put_record(), get_record(), delete_record() for feature groups.

[juliensimon]

Docs are now online at https://sagemaker.readthedocs.io/en/stable/api/prep_data/feature_store.html

Thank you @jkroll-aws