docs: Add reference to meta function return types in route module documentation

[mobregozo]

Description

Adds a reference to the meta function return type MetaDescriptor, so that other sorts of meta types, apart from the regular meta tags, are more visible from the documentation.

Context

For anyone working on improving SEO, there are multiple ways to introduce structured data with scripts, but being able to make it using the meta function doesn't seem to be particularly obvious in the documentation; thus, I thought about adding this callout to the auto-generated type alias.

[changeset-bot]

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Latest commit: f37b7d6

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[remix-cla-bot]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳