docs: Update session-access.md

[matteioo]

Update docs to reflect breaking changes in signUp function's now-removed third parameter.

🔗 Linked issue

#1034

❓ Type of change

• 📖 Documentation (updates to the documentation, readme or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

📝 Checklist

• I have linked an issue or discussion.
• I have added tests (if possible).
• I have updated the documentation accordingly.

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@sidebase/nuxt-auth@1035

commit: 232b57b

[zoey-kaiser]

Thanks for catching this ❤