docs: improve Auth.js integration page

[Shane-Donlon]

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Description

Ciao Gio (it's usually Gio that reviews these)

As per discussion with Ian in Discord.

There are other references to redirectTo on this page.
But from my testing this morning the below is still valid,
So not every refence to redirectTo needed to be adjusted.

<Form action={signOut}>
      <input type="hidden" name="redirectTo" value="/signedout" />
      <button>Sign Out</button>
</Form>

Link to Discord Chat below:

https://discord.com/channels/842438759945601056/1334857616295333909

Checklist

• [ x] My code follows the developer guidelines of this project
• [x ] I performed a self-review of my own code
• [x ] I made corresponding changes to the Qwik docs

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[gioboa]

Thanks @Shane-Donlon
It looks great to me, thanks 🎉👏
Auth.js internally is moving to redirectTo but in this case your fix it's awesome 😎