Fix reference to TaskFlow

Author: yoeo

airflow-core/docs/authoring-and-scheduling/assets.rst

@@ -230,7 +230,7 @@ The other way around also applies:
         """Process inlet example_asset..."""
 
 In addition, ``@asset`` can be used with ``@task`` to customize the task that generates the asset,
-utilizing the modern TaskFlow approach described in :doc:/tutorial/taskflow.
+utilizing the modern TaskFlow approach described in :doc:`/tutorial/taskflow`.
 
 This combination allows you to set initial arguments for the task and to use various operators, such as the ``BashOperator``: