Adjust span of fn argument declaration #100458
                
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Span of a fn argument declaration goes from:
to:
That is, we don't include the extra spacing up to the trailing comma, which I think is more correct.
cc #99646 (comment)
r? @estebank
The two tests that had dramatic changes in their rendering I think actually are improved, though they are kinda poor spans both before and after the changes. 🤷 Thoughts?