Fix .subscribe's type

[jviide]

Currently .subscribe()'s type is marked as subscribe(fn: (value: T) => () => void) (".subscribetakes a function that returns a function, .subscribe itself returns void").

This PR changes it to subscribe(fn: (value: T) => void): () => void (".subscribe takes a function, and .subscribe itself returns a function").

[changeset-bot]

🦋 Changeset detected

Latest commit: 4385ea8

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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@preact/signals-core	Patch

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[marvinhagemeister]

Thanks for the PR, I don't know how I could've gotten that wrong 🙈