add arg to docstring

Signed-off-by: niklasvm <niklasvm@gmail.com>

sdk/python/feast/infra/offline_stores/contrib/spark_offline_store/spark_source.py

@@ -65,6 +65,8 @@ def __init__(
                 maintainer.
             timestamp_field: Event timestamp field used for point-in-time joins of
                 feature values.
+            date_partition_column: The column to partition the data on for faster
+                retrieval. This is useful for large tables and will limit the number ofi
         """
         # If no name, use the table as the default name.
         if name is None and table is None: