docs: ✏️ add two details to the Parquet docs
1. refs/convert/parquet lives in parallel to `main` and is not meant to be merged, 2. the parquet native datasets are not converted
docs: ✏️ add two details to the Parquet docs: 1. refs/convert/parquet lives in parallel to `main` and is not meant to be merged, 2. the parquet native datasets are not converted