addition to top-level statements #40230
Merged
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Summary
This PR adds a mention of return values and command line arguments to the main command line example of top-level statements.
It also updates the example to show an example.
I didn't add more information because I was afraid that it would just be a repetition of the referenced article about top level statements.
Should both articles reference each other add the bottom of the page in a "See also" section?
Fixes #40064
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