Revert Asset to Dataset for Core Extension Doc

This PR reverts Core Extension doc change (https://airflow.apache.org/docs/apache-airflow-providers/core-extensions/index.html) from #41348

Since those docs only work on Airflow stable, we can only change this after 3.0

Author: kaxil

docs/apache-airflow-providers/core-extensions/asset-schemes.rst

@@ -15,14 +15,17 @@
     specific language governing permissions and limitations
     under the License.
 
-asset URI Schemes
+Dataset URI Schemes
 -------------------
 
-This is a summary of all Apache Airflow Community provided implementations of asset URI schemes
+This is a summary of all Apache Airflow Community provided implementations of dataset URI schemes
 exposed via Airflow core and community-managed providers.
 
-See :doc:`documentation on assets <apache-airflow:authoring-and-scheduling/assets>` for details on how asset URIs work.
+..
+  TODO: Change this from Dataset to Asset in Airflow 3.0
 
-.. airflow-asset-schemes::
+See :doc:`documentation on Datasets <apache-airflow:authoring-and-scheduling/datasets>` for details on how dataset URIs work.
+
+.. airflow-dataset-schemes::
    :tags: None
    :header-separator: "

docs/apache-airflow-providers/howto/create-custom-providers.rst

@@ -95,10 +95,12 @@ Exposing customized functionality to the Airflow's core:
 
 * ``filesystems`` - this field should contain the list of all the filesystem module names.
   See :doc:`apache-airflow:core-concepts/objectstorage` for description of the filesystems.
+..
+  TODO: Change this from Dataset to Asset in Airflow 3.0
 
-* ``asset-uris`` - this field should contain the list of the URI schemes together with
+* ``dataset-uris`` - this field should contain the list of the URI schemes together with
   class names implementing normalization functions.
-  See :doc:`apache-airflow:authoring-and-scheduling/assets` for description of the asset URIs.
+  See :doc:`apache-airflow:authoring-and-scheduling/datasets` for description of the dataset URIs.
 
 .. note:: Deprecated values