fix typo on docstring (#337)

[codecov[bot]]

Codecov Report

Merging #338 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #338   +/-   ##
=======================================
  Coverage   67.69%   67.69%           
=======================================
  Files          12       12           
  Lines        1269     1269           
=======================================
  Hits          859      859           
  Misses        410      410

Impacted Files	Coverage Δ
cdqa/utils/converters.py	78.64% <ø> (ø)	:arrow_up:

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[fmikaelian]

Thanks @andreshazard !