docs: Fix Expr.all description of Kleene logic

[lukemanley]

closes #17373

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.98%. Comparing base (62ebbe5) to head (29aa288).
Report is 34 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #20409      +/-   ##
==========================================
+ Coverage   78.97%   78.98%   +0.01%     
==========================================
  Files        1562     1562              
  Lines      220103   220103              
  Branches     2486     2486              
==========================================
+ Hits       173821   173858      +37     
+ Misses      45709    45672      -37     
  Partials      573      573              

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[rodrigogiraoserrao]

Thanks. This is a bit more concise than the suggestion in the linked issue. 🚀