remove stray formula from docstring

[cdc-mitzimorris]

Closes #631

[damonbayer]

😅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.98%. Comparing base (b6928be) to head (d5fb0c2).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #632   +/-   ##
=======================================
  Coverage   96.98%   96.98%           
=======================================
  Files          42       42           
  Lines        1094     1094           
=======================================
  Hits         1061     1061           
  Misses         33       33           

Flag	Coverage Δ
unittests	96.98% <ø> (ø)

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[github-actions]

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