Update planetscale.mdx

[ammubhave]

Fix planetscale docs for hyperdrive

Summary

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Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Updated documentation for connecting Hyperdrive to PlanetScale, correcting references from Postgres to MySQL.

• Corrected database type from Postgres to MySQL in the documentation.
• Updated links to reflect the correct PlanetScale website.
• Adjusted descriptions and titles for consistency with the MySQL database.

Modified Files

• src/content/docs/hyperdrive/examples/connect-to-mysql/planetscale.mdx

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