docs: add type assertion to React.JSX.Element type

[karlhorky]

Description

Add TypeScript type assertion to the React.JSX.Element type, because hast-util-to-jsx-runtime will not update types for React 19:

• Type error reported by @typescript-eslint/no-unsafe-return syntax-tree/hast-util-to-jsx-runtime#10 (comment)

The hast-util-to-jsx-runtime project recommends adding back the JSX global namespace:

• Type error reported by @typescript-eslint/no-unsafe-return syntax-tree/hast-util-to-jsx-runtime#10 (comment)

But this seems like an unusual way, considering that the ecosystem is moving away from that.

So I suggest the type assertion to work around this.

@antfu if you would prefer a different type eg. ReactElement or some other method like adding back the global JSX namespace, I can do that instead.

Linked Issues

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Additional context

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