Add example and warning for comma-separated query input values #3344
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As mentioned on #3343, Tapir only supports comma-separated values (out of the box, that is) on Scala 2.13+.
This small PR makes that explicit in the main documentation, as it would've personally saved me a few minutes.
For good measure, I also added a complete runnable example.
To be fair, the existing doc page already includes clear code, but I thought a complete example could still be useful. Wdyt?
p.s. It's my first contribution to Tapir. It's a very small one and only touches documentation, but still, I'd be extra careful in case I missed something :)