fix: correct casing of “PlanetScale”

[skullface]

Closes #

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• I have followed every step in the contributing guide (updated 2022-10-06).
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Changelog

Noticed in my last run of npx create-t3-app that “PlanetScale” incorrectly appears as “Planetscale” in the prompt (screenshot below). This PR fixes that instance and a few instances across documentation.

Disclosure: I am a PlanetScale employee 😄

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Screenshots

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