Fix typo in documentation

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.29%. Comparing base (9b8bf1c) to head (5582174). Report is 10 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #241 +/- ## ========================================== + Coverage 88.13% 88.29% +0.16% ========================================== Files 15 15 Lines 3440 3470 +30 Branches 793 803 +10 ========================================== + Hits 3032 3064 +32 + Misses 297 296 -1 + Partials 111 110 -1 ```

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[FabianHofmann]

Thanks @staadecker