docs: fix missing plain prop #12962

[namefhf]

fix missing plain prop

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.69%. Comparing base (77745ab) to head (e5169f9).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12963      +/-   ##
==========================================
+ Coverage   89.64%   89.69%   +0.05%     
==========================================
  Files         257      257              
  Lines        6979     6979              
  Branches     1719     1719              
==========================================
+ Hits         6256     6260       +4     
+ Misses        383      379       -4     
  Partials      340      340              

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[chenjiahan]

Thanks!