docs: fix typo (backport #8272)

[wzyboy]

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[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.68%. Comparing base (99ee635) to head (b379202).
Report is 19 commits behind head on 1.4-maint.

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Additional details and impacted files

@@              Coverage Diff              @@
##           1.4-maint    #8275      +/-   ##
=============================================
+ Coverage      82.45%   82.68%   +0.23%     
=============================================
  Files             38       38              
  Lines          11026    11026              
  Branches        2116     2116              
=============================================
+ Hits            9091     9117      +26     
+ Misses          1366     1344      -22     
+ Partials         569      565       -4     

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