Fix typo in doc strings for r2

[awadell1]

Variant is :MacFadden in the docs, but :McFadden in the if else branch. Googling / Wikipedia confirms that "McFadden" is correct

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (20b38e1) to head (2329ea0). Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #33   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         2    -1     
  Lines           37        36    -1     
=========================================
- Hits            37        36    -1     

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[awadell1]

@palday Done! Should be good to go 😄