doc changes for feature group and dataset

Author: yogesh266

ads/feature_store/docs/source/dataset.rst

@@ -245,6 +245,25 @@ You can call the ``get_input_schema_dataframe()`` method of the Dataset instance
   df = dataset.get_input_schema_dataframe()
   df.show()
 
+Preview
+========
+
+.. deprecated:: 1.0.3
+   Use :func:`as_of` instead.
+
+You can call the ``preview()`` method of the Dataset instance to preview the dataset.
+
+The ``.preview()`` method takes the following optional parameter:
+- ``timestamp: date-time``. Commit timestamp for dataset
+- ``version_number: int``. Version number for dataset
+- ``row_count: int``. Defaults to 10. Total number of row to return
+
+.. code-block:: python3
+
+  # Preview dataset
+  df = dataset.preview(row_count=50)
+  df.show()
+
 as_of
 =======
 

ads/feature_store/docs/source/feature_group.rst

@@ -283,6 +283,26 @@ Feature store provides an API similar to Pandas to join feature groups together
   # Filter feature group
   feature_group.filter(feature_group.col1 > 10).show()
 
+
+Preview
+=======
+
+.. deprecated:: 1.0.3
+   Use :func:`as_of` instead.
+
+You can call the ``preview()`` method of the FeatureGroup instance to preview the feature group.
+
+The ``.preview()`` method takes the following optional parameter:
+
+- ``timestamp: date-time``. Commit timestamp for feature group
+- ``version_number: int``. Version number for feature group
+- ``row_count: int``. Defaults to 10. Total number of row to return
+
+.. code-block:: python3
+
+  # Preview feature group
+  df = feature_group.preview(row_count=50)
+
 as_of
 =======