boxplot whis keyword docstring clarification (#2427)
boxplot whis keyword docstring clarification (#2427)

* whis keyword docstring change

* Tweak language

Co-authored-by: Michael Waskom <d5dfd9ee4732cc7ab0c18e31bd742af3a5a54d3e@users.noreply.github.com>
arokem/seaborn,mwaskom/seaborn,mwaskom/seaborn,arokem/seaborn