viable/strict/1787946215: Publicize optim functional APIs under `torch.optim.functional` (#194986)
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What happened
This PR, in short, does: expose and publicize functional APIs (they already existed) document this more uniformly add big examples in optim.md for using them (and also step hooks), notably a bf16 adamw example. Pull Request resolved: #194986 Approved by: https://github.com/albanD
Summary assembled by rule from the sources below