Fix example in Fortran API

[awvwgk]

Closes #105

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.02%. Comparing base (3a50cbd) to head (54c8869).
Report is 25 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #107      +/-   ##
==========================================
- Coverage   48.63%   46.02%   -2.62%     
==========================================
  Files          34       25       -9     
  Lines        3707     2866     -841     
  Branches     1518     1294     -224     
==========================================
- Hits         1803     1319     -484     
+ Misses       1207      970     -237     
+ Partials      697      577     -120     

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