Update the tutorial to add the ? operator #7064
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This PR adds a section on the
?try operator.As the
Result.try+?section was getting a bit long, I added an explicit "Error handling" section. I think it's an important topic so it's worth making it stand out a bit more.Also, when the
!operator is introduced, I think it's useful to say it's similar to the?operator, but forTaskinstead ofResult.