doc: enhanced the auth route documentation

[medinasheriff]

What type of PR is this?

Documentation enhancement.

Check all applicable

• [ ] 🍕 Feature
• [ ] 🐛 Bug Fix
• [x] 📝 Documentation
• [ ] 🧑‍💻 Refactor
• [x] ✅ Test
• [ ] 🤖 Build or CI
• [ ] ❓ Other (please specify)

Related Issue :

• Resolve #219

What does this PR do ?

This PR enhances the raw data API by explicitly describing the type of HTTPException raised (403) for some of the routes as well as uniformity in the way the result is returned to users. By the /auth/login/ and /auth/callback/

Screenshots :

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