DOC: timedelta return type (#44592)
DOC: timedelta return type (#44592)

* DOC: change return type #42316

* DOC: updating docstring

* Doc changing the Returns docstring to adhere to to_datetime structure

* DOC: combining types
pandas-dev/pandas,pandas-dev/pandas,datapythonista/pandas,pandas-dev/pandas,datapythonista/pandas,pandas-dev/pandas,datapythonista/pandas,datapythonista/pandas