docs: rework simple example

[shadowspawn]

Problem

The example in the (upstream) simple example does not show typical usage, with hard-coded args and no command-line invocation. It includes positionals in the return values which will never be present with the simple strict configuration.

Solution

A range of minor updates:

• don't supply args, use automatic detection
• refactor options to be more compact (and maybe easier to read)
• don't collect positionals from result
• use console block to show example output
• update local example to match

[shadowspawn]

I don't feel strongly enough about this to pursue an upstream PR!