…ars-R-Us#2943)

* Closes Bears-R-Us#2924 update pydoc strings for arkouda dataframe

* Comment out GroupBy from __all__ to prevent import conflicts

* remove sphix Ipython extension, as not yet being used

* changes based on code review

* more minor changes in response to code review.

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Co-authored-by: Amanda Potts <ajpotts@users.noreply.github.com>