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3c1ca869 - Improve docstrings and type hints in scheduling_ddpm.py (#12651)

Improve docstrings and type hints in scheduling_ddpm.py (#12651) * Enhance type hints and docstrings in scheduling_ddpm.py - Added type hints for function parameters and return types across the DDPMScheduler class and related functions. - Improved docstrings for clarity, including detailed descriptions of parameters and return values. - Updated the alpha_transform_type and beta_schedule parameters to use Literal types for better type safety. - Refined the _get_variance and previous_timestep methods with comprehensive documentation. * Refactor docstrings and type hints in scheduling_ddpm.py - Cleaned up whitespace in the rescale_zero_terminal_snr function. - Enhanced the variance_type parameter in the DDPMScheduler class with improved formatting for better readability. - Updated the docstring for the compute_variance method to maintain consistency and clarity in parameter descriptions and return values. * Apply `make fix-copies` * Refactor type hints across multiple scheduler files - Updated type hints to include `Literal` for improved type safety in various scheduling files. - Ensured consistency in type hinting for parameters and return types across the affected modules. - This change enhances code clarity and maintainability.