doc: fix typo

[fingolfin]

Fixes #6437

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.88%. Comparing base (25b1ec2) to head (a826ea5).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6438      +/-   ##
==========================================
- Coverage   78.88%   78.88%   -0.01%     
==========================================
  Files         682      685       +3     
  Lines      293075   293515     +440     
  Branches     8587     8667      +80     
==========================================
+ Hits       231201   231541     +340     
- Misses      60088    60165      +77     
- Partials     1786     1809      +23     

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[ThomasBreuer]

Thanks.