correct doc for Series.cumsum (#696)
correct doc for Series.cumsum (#696)

* correct doc for Series.cumsum

* delete note

* Fix docstring for series.cumsum()

* Minor fix in docstring for series.cumsum()

Co-authored-by: Denis <fd202510e9f0b4fe2d239544626dd8777300a6be@intel.com>
IntelLabs/hpat,IntelLabs/hpat,IntelLabs/hpat,IntelLabs/hpat