fix: Comment regarding PlanetScale foreign key support

[ahkhanjani]

PlanetScale now supports foreign key constraints.

✅ Checklist

• I have followed every step in the contributing guide (updated 2022-10-06).
• The PR title follows the convention we established conventional-commit
• I performed a functional test on my final commit

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Changelog

• Fixed a comment in PlanetScale Prisma schema regarding the support of foreign key constraints.

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Screenshots

[Screenshots]

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Latest commit: 6193ef4

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