update typing for StringifyOptions["lineWidth"] to match comment

[robert-westenberger]

Fixes #16

[eemeli]

Yup, that looks appropriate. The alternative would've been to change the comment to say something like "use 0 to disable", as that would work as well.

The 80 in 80 | number is indeed unnecessary, but also apparently ignored. I can't recall for sure, but there may have been some tooling around when I wrote this that showed the raw expression in autocompletion, where it'd hint at the default value.

Styling the comments as /** ... */ before each option instead of // ... would I think get them picked up by tools, which might be nice. The comment would also be a more appropriate place to indicate the default value. I'd be happy to review another PR making such a change... 😇