documentation: SMP v2 doc updates (#1423)

doc/api/training/distributed.rst

@@ -22,10 +22,19 @@ The SageMaker Distributed Data Parallel Library
 The SageMaker Distributed Model Parallel Library
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-.. toctree::
-   :maxdepth: 2
-
-   smd_model_parallel
-   smp_versions/latest
-   smd_model_parallel_general
-   smd_model_parallel_release_notes/smd_model_parallel_change_log
+.. note::
+
+    Since the release of the SageMaker model parallelism (SMP) version 2 in December 2023,
+    this documentation is no longer supported for maintenence.
+    The live documentation is available at
+    `SageMaker model parallelism library v2
+    <https://docs.aws.amazon.com/sagemaker/latest/dg/model-parallel-v2.html>`_
+    in the *Amazon SageMaker User Guide*.
+
+    The documentation for the SMP library v1.x is archived and available at
+    `Run distributed training with the SageMaker model parallelism library
+    <https://docs.aws.amazon.com/sagemaker/latest/dg/model-parallel.html>`_
+    in the *Amazon SageMaker User Guide*,
+    and the SMP v1.x API reference is available in the
+    `SageMaker Python SDK v2.199.0 documentation
+    <https://sagemaker.readthedocs.io/en/v2.199.0/api/training/distributed.html#the-sagemaker-distributed-model-parallel-library>`_.