Fix checks for correct number of arguments in the examples

[nilsfriess]

Some of the examples use wrong numbers in the if that checks for the correct number of command line arguments.

[PierreMarchand20]

Thank you for your PR! I modified a little bit the changes, I will merge once CI done.

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 98.01%. Comparing base (658d8f0) to head (358cb26). :warning: Report is 30 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #68      +/-   ##
==========================================
+ Coverage   97.19%   98.01%   +0.81%     
==========================================
  Files          80      183     +103     
  Lines        5132    10007    +4875     
==========================================
+ Hits         4988     9808    +4820     
- Misses        144      199      +55     

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