[DOC] Convert TFT tuning and utils docstrings to numpydoc style#2097

Siddhazntx wants to merge 4 commits intosktime:mainsktime/pytorch-forecasting:mainfrom

Siddhazntx:refactor/numpydoc-tuning-utilsSiddhazntx/pytorch-forecasting:refactor/numpydoc-tuning-utilsCopy head branch name to clipboard