chore: import upstream snapshot with attribution

docs/code-docs/source/moe.rst

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+Mixture of Experts (DeepSpeed MoE)
+==================================
+
+DeepSpeed provides two forms of MoE support: DeepSpeed MoE and :doc:`AutoEP
+(Automatic Expert Parallelism) <autoep>`. DeepSpeed MoE is the explicit
+``deepspeed.moe.layer.MoE`` API for constructing MoE layers in model code. This
+page introduces the DeepSpeed MoE API.
+
+See also the `Mixture of Experts (DeepSpeed MoE) tutorial
+<https://www.deepspeed.ai/tutorials/mixture-of-experts/>`__ for training
+examples and configuration details.
+
+.. autoclass:: deepspeed.moe.layer.MoE
+    :members: