fixed typo in docs

[Alek050]

closes #376

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.28%. Comparing base (e4ce2b3) to head (eacf319).
⚠️ Report is 88 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #377      +/-   ##
===========================================
+ Coverage    99.22%   99.28%   +0.05%     
===========================================
  Files           49       67      +18     
  Lines         3736     5441    +1705     
===========================================
+ Hits          3707     5402    +1695     
- Misses          29       39      +10     

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