Clarify relation between DateOffset and relativedelta (#42251)
Clarify relation between DateOffset and relativedelta (#42251)

dateutil.relativedelta can be constructed either from two date/datetime objects passed as positional arguments, or explicitly constructed in terms of year, month, day etc passed as keyword arguments. DateOffset only supports the keyword argument form of relativedelta.
gfyoung/pandas,dsm054/pandas,datapythonista/pandas,dsm054/pandas,pandas-dev/pandas,rs2/pandas,dsm054/pandas,pandas-dev/pandas,jorisvandenbossche/pandas,rs2/pandas,gfyoung/pandas,gfyoung/pandas,datapythonista/pandas,datapythonista/pandas,pandas-dev/pandas,pandas-dev/pandas,jorisvandenbossche/pandas,gfyoung/pandas,gfyoung/pandas,rs2/pandas,dsm054/pandas,dsm054/pandas,rs2/pandas,jorisvandenbossche/pandas,jorisvandenbossche/pandas,datapythonista/pandas