v2.8.18-canary.19

<!-- Release notes generated using configuration in .github/release.yml at v2.8.18-canary.19 -->

What's Changed

Changelog

• docs: Clean up futureFlags description by @anthonyshew in https://github.com/vercel/turborepo/pull/12355

Full Changelog: https://github.com/vercel/turborepo/compare/v2.8.18-canary.18...v2.8.18-canary.19