doc additions (#46194)
doc additions (#46194)

Co-authored-by: JHM Darbyshire (MBP) <b32871036c101b60230520bcfd5b135420a0dde3@users.noreply.github.com>
pandas-dev/pandas,pandas-dev/pandas,datapythonista/pandas,pandas-dev/pandas,pandas-dev/pandas,datapythonista/pandas,datapythonista/pandas,datapythonista/pandas