Add TaskGroup howto docs with example DAG

airflow-core/docs/howto/index.rst

@@ -60,3 +60,4 @@ configuring an Airflow environment.
     run-with-self-signed-certificate
     performance
     memory-profiling
+    task-group

airflow-core/docs/howto/task-group.rst

@@ -0,0 +1,35 @@
+ .. Licensed to the Apache Software Foundation (ASF) under one
+    or more contributor license agreements.  See the NOTICE file
+    distributed with this work for additional information
+    regarding copyright ownership.  The ASF licenses this file
+    to you under the Apache License, Version 2.0 (the
+    "License"); you may not use this file except in compliance
+    with the License.  You may obtain a copy of the License at
+
+ ..   http://www.apache.org/licenses/LICENSE-2.0
+
+ .. Unless required by applicable law or agreed to in writing,
+    software distributed under the License is distributed on an
+    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+    KIND, either express or implied.  See the License for the
+    specific language governing permissions and limitations
+    under the License.
+
+Organizing tasks with TaskGroups
+---------------------------------
+
+When a Dag has many related tasks, you can group them visually using
+:class:`~airflow.sdk.TaskGroup`. This keeps the Graph view readable and
+lets you organize tasks into logical sections, including nested groups.
+
+.. exampleinclude:: /../src/airflow/example_dags/example_task_group.py
+    :language: python
+    :start-after: [START howto_task_group_section_1]
+    :end-before: [END howto_task_group_section_1]
+
+TaskGroups can also be nested inside one another:
+
+.. exampleinclude:: /../src/airflow/example_dags/example_task_group.py
+    :language: python
+    :start-after: [START howto_task_group_section_2]
+    :end-before: [END howto_task_group_section_2]