dart-migrate-to-checks-package: negative example has an unmatched quote (triggerSync") #46

In skills/dart-migrate-to-checks-package/SKILL.md, the "NO" example under the synchronous .throws<E>() section is meant to show that passing a callback to a synchronous throws is a compile error. But the snippet is already malformed for an unrelated reason: triggerSync" has a stray double quote, so the line fails to parse before it can demonstrate the callback-type error the prose describes.

https://github.com/dart-lang/skills/blob/26b2dcc/skills/dart-migrate-to-checks-package/SKILL.md#L174

// NO (Passing a callback to sync throws will cause a compiler error!)
check(() => triggerSync").throws<ArgumentError>((it) => ...); // ERROR!

Suggested fix: use the same identifier as the valid example directly above it, so the only thing wrong with the line is the thing the example is about:

check(() => triggerSyncError()).throws<ArgumentError>((it) => ...); // ERROR!

Found while reviewing the skills vendored into a project via npx skills add dart-lang/skills --skill '*' --agent universal (skill hash 00b7fa02… in skills-lock.json).