chore: import upstream snapshot with attribution

docs/code-docs/source/kernel.rst

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+Transformer Kernels
+===================
+
+The transformer kernel API in DeepSpeed can be used to create BERT transformer layer for
+more efficient pre-training and fine-tuning, it includes the transformer layer configurations and
+transformer layer module initialization.
+
+Here we present the transformer kernel API.
+Please see the `BERT pre-training tutorial <https://www.deepspeed.ai/tutorials/bert-pretraining/>`_ for usage details.
+
+DeepSpeed Transformer Config
+----------------------------
+.. autoclass:: deepspeed.DeepSpeedTransformerConfig
+
+DeepSpeed Transformer Layer
+----------------------------
+.. autoclass:: deepspeed.DeepSpeedTransformerLayer