Docstring fix

[kajocina]

Please provide a high-level summary of the changes for the changes and notes for the reviewers

• [X] Code passes all tests
• [ ] Unit tests provided for these changes
• [X] Documentation and docstrings added for these changes

Changes

• minor docstring fixes
• fixed one return to give only rho intead of th the Tuple(rho, pval)

[codecov-commenter]

Codecov Report

Merging #47 (ba13d89) into main (3e26652) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #47   +/-   ##
=======================================
  Coverage   99.36%   99.36%           
=======================================
  Files          16       16           
  Lines         950      950           
=======================================
  Hits          944      944           
  Misses          6        6           

Impacted Files	Coverage Δ
rexmex/metrics/ranking.py	100.00% <ø> (ø)
rexmex/metrics/rating.py	100.00% <100.00%> (ø)

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