docstring update

[ArunS-tack]

closes #223.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +3.70 🎉

Comparison is base (e03407a) 90.04% compared to head (524dda4) 93.75%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #287      +/-   ##
==========================================
+ Coverage   90.04%   93.75%   +3.70%     
==========================================
  Files          28       28              
  Lines        1467     1730     +263     
==========================================
+ Hits         1321     1622     +301     
+ Misses        146      108      -38     

Impacted Files	Coverage Δ
src/fisher.jl	97.70% <ø> (+1.86%)	⬆️
src/power_divergence.jl	98.48% <0.00%> (-0.91%)	⬇️
src/f.jl	66.66% <0.00%> (ø)
src/common.jl	100.00% <0.00%> (ø)
src/var_equality.jl	98.24% <0.00%> (+0.24%)	⬆️
src/permutation.jl	80.00% <0.00%> (+0.83%)	⬆️
src/anderson_darling.jl	88.43% <0.00%> (+0.93%)	⬆️
src/HypothesisTests.jl	83.33% <0.00%> (+1.07%)	⬆️
src/durbin_watson.jl	98.91% <0.00%> (+1.47%)	⬆️
src/augmented_dickey_fuller.jl	93.15% <0.00%> (+1.84%)	⬆️
... and 19 more

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