docs: fix up env links in auth.js section

[tonievictor]

What is it?

• [ ] Feature / enhancement
• [ ] Bug
• [x] Docs / tests / types / typos
• [ ] Infra

Description

I noticed that the links to the environment variables docs in the documentation were broken (I think it still linked to an old route). I've gone ahead to update it.

Checklist:

• [x] My code follows the developer guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have ran pnpm change and documented my changes
• [ ] I have made corresponding changes to the Qwik docs
• [ ] Added new tests to cover the fix / functionality

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Latest commit: 82193d1ecb531797ba3531a551075e548efd35cd

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