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7f6373d2 - [Docs] Add `sigmoid` beta_scheduler to docstrings of relevant Schedulers (#3399)

[Docs] Add `sigmoid` beta_scheduler to docstrings of relevant Schedulers (#3399) * Add `sigmoid` beta scheduler to `DDPMScheduler` docstring * Add `sigmoid` beta scheduler to `RePaintScheduler` docstring --------- Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>