docs: fix vercel serverless deprecated error

[Shane-Donlon]

Full error:
The "@astrojs/vercel/serverless" import is deprecated and will be removed in a future release. Please import from "@astrojs/vercel" instead.

Description (required)

Hi everyone when running an astro build in vercel I came accross this error
The "@astrojs/vercel/serverless" import is deprecated and will be removed in a future release. Please import from "@astrojs/vercel" instead.

Output from running npx astro add vercel

import vercel from "@astrojs/vercel";

  adapter: vercel(),

This PR brings the docs inline with the NPX output.

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[sarah11918]

Thank you so much for catching this and taking the time to fix it @Shane-Donlon ! We really appreciate it, and are happy to welcome you to Team Docs! 🥳

[ArmandPhilippot]

LGTM! We have updated the integration page but we forgot that one. Thanks @Shane-Donlon for noticing that! And welcome to team Docs! 🎉