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15370f84 - Improve docstrings and type hints in scheduling_pndm.py (#12676)

Improve docstrings and type hints in scheduling_pndm.py (#12676) * Enhance docstrings and type hints in PNDMScheduler class - Updated parameter descriptions to include default values and specific types using Literal for better clarity. - Improved docstring formatting and consistency across methods, including detailed explanations for the `_get_prev_sample` method. - Added type hints for method return types to enhance code readability and maintainability. * Refactor docstring in PNDMScheduler class to enhance clarity - Simplified the explanation of the method for computing the previous sample from the current sample. - Updated the reference to the PNDM paper for better accessibility. - Removed redundant notation explanations to streamline the documentation.