📚 Documentation: add await to cookies().get() as it returns a promise next.js-ssr-auth demo

[hefler]

💭 Description

On step 3 of the documentation for Server-side authentication with Next.js on line 11 of the sample code:

website/src/routes/docs/tutorials/nextjs-ssr-auth/step-3/+page.markdoc

Line 23 in b605649

const session = cookies().get("my-custom-session");

It might benefit from adding an await on this call, since the method cookies().get() returns a Promise (as per MDN docs).

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