DOC: update the DataFrame.cov docstring#20245

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TomAugspurger merged 2 commits intopandas-dev:masterfrom

sechilds:docstring_cov

Mar 11, 2018

Commits on Mar 10, 2018

DOC: Revise docstring of DataFrame cov method
sechilds
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Commits on Mar 11, 2018

DOC: Fix See Also and min_periods explanation.
sechilds
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