Tiny doc-string fix

[sarnold]

• fix typo in utility doc-string

[codecov]

Codecov Report

Merging #3 (7720f18) into master (40f0651) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #3   +/-   ##
=======================================
  Coverage   87.42%   87.42%           
=======================================
  Files           2        2           
  Lines         803      803           
  Branches      159      159           
=======================================
  Hits          702      702           
  Misses         61       61           
  Partials       40       40           

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