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6fe4a6ff - Improve docstrings and type hints in scheduling_ddim.py (#12622)

Improve docstrings and type hints in scheduling_ddim.py (#12622) * Improve docstrings and type hints in scheduling_ddim.py - Add complete type hints for all function parameters - Enhance docstrings to follow project conventions - Add missing parameter descriptions Fixes #9567 * Enhance docstrings and type hints in scheduling_ddim.py - Update parameter types and descriptions for clarity - Improve explanations in method docstrings to align with project standards - Add optional annotations for parameters where applicable * Refine type hints and docstrings in scheduling_ddim.py - Update parameter types to use Literal for specific string options - Enhance docstring descriptions for clarity and consistency - Ensure all parameters have appropriate type annotations and defaults * Apply review feedback on scheduling_ddim.py - Replace "prevent singularities" with "avoid numerical instability" for better clarity - Add backticks around `alpha_bar` variable name for consistent formatting - Convert Imagen Video paper URLs to Hugging Face papers references * Propagate changes using 'make fix-copies' * Add missing Literal