Stat ranges to docs

[oakla]

Reference issue

"Add Range of Friedman Rafsky Test Statistic #329 https://github.com/neurodata/hyppo/issues/329

Type of change

Documentation

What does this implement/fix?

Adds the range of the Friedman Rafsky (uncorrected) test statistic

Additional information

Some verification of the range of expected values can been seen in this notebook

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[codecov[bot]]

Codecov Report

Merging #331 (81aa76f) into dev (8c28ff6) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #331   +/-   ##
=======================================
  Coverage   96.24%   96.24%           
=======================================
  Files          47       47           
  Lines        2292     2292           
=======================================
  Hits         2206     2206           
  Misses         86       86           

Impacted Files	Coverage Δ
hyppo/independence/friedman_rafsky.py	100.00% <ø> (ø)

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[sampan501]

you have some merge conflicts. Once those are fixed, I'll review