Fix ConstraintsInterpretation docstring

[klamike]

Thanks for the great package! I found this small typo when looking through the docs -- the example has InterpretConstraintsAsBounds instead of ConstraintsInterpretation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.80%. Comparing base (b853398) to head (26758df).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #169   +/-   ##
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  Coverage   95.80%   95.80%           
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  Files           5        5           
  Lines        1097     1097           
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  Hits         1051     1051           
  Misses         46       46           

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