fix documentation for All, which actually returns false

[nitram509]

Please provide a brief description of the change.

The documentation for All in the README was wrong - the correct return value is false.

Which issue does this change relate to?

n/a

Contribution checklist.

Replace the space in each box with "X" to check it off.

• I have read and understood the CONTRIBUTING guidelines
• All commits in my PR conform to the commit hygiene section
• I have added relevant tests
• I have not added any dependencies

Additional context

n/a

[BooleanCat]

Good spot, thanks @nitram509

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (79c0d91) to head (e9ce5b8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #154   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           34        34           
  Lines          624       624           
=========================================
  Hits           624       624           

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