update docs link for arrow-datasets (#1064)

Author: esoteric-ephemera

mp_api/client/core/utils.py

@@ -308,7 +308,7 @@ def __getitem__(self, idx):
                 """
                 Pythonic slicing of arrow-based MPDatasets is sub-optimal, consider using
                 idiomatic arrow patterns. See MP's docs on MPDatasets for relevant examples:
-                docs.materialsproject.org/downloading-data/arrow-datasets
+                docs.materialsproject.org/materials-project-data-lakehouse/arrow-datasets
                 """,
                 MPDatasetSlicingWarning,
                 stacklevel=2,
@@ -326,7 +326,7 @@ def __getitem__(self, idx):
             """
             Pythonic indexing into arrow-based MPDatasets is sub-optimal, consider using
             idiomatic arrow patterns. See MP's docs on MPDatasets for relevant examples:
-            docs.materialsproject.org/downloading-data/arrow-datasets
+            docs.materialsproject.org/materials-project-data-lakehouse/arrow-datasets
             """,
             MPDatasetIndexingWarning,
             stacklevel=2,
@@ -345,7 +345,7 @@ def __iter__(self):
                 """
                 Iterating through arrow-based MPDatasets is sub-optimal, consider using
                 idiomatic arrow patterns. See MP's docs on MPDatasets for relevant examples:
-                docs.materialsproject.org/downloading-data/arrow-datasets
+                docs.materialsproject.org/materials-project-data-lakehouse/arrow-datasets
                 """,
                 MPDatasetIterationWarning,
                 stacklevel=2,