chore: adds guide for updating email post login

[jscyo]

Summary of change

(A few sentences about this PR)

Related issues

• Link to issue1 here
• Link to issue1 here

Checklist

• [ ] Algolia search needs to be updated? (If there is a new sub docs project, then yes)
• [ ] Sitemap needs to be updated? (If there is a new sub docs project, then yes)
• [ ] Checked for broken links? (Run cd v2 && MODE=production npx docusaurus build)
• [ ] Changes required to the demo apps corresponding to the docs?

Remaining TODOs for this PR

• [ ] Item1
• [ ] Item2

[netlify[bot]]

✅ Deploy Preview for admiring-bhabha-7b1be9 ready!

Name	Link
🔨 Latest commit	10dbdd6ee77837cebeac5a01e8782c4f8ad06e8e
🔍 Latest deploy log	https://app.netlify.com/sites/admiring-bhabha-7b1be9/deploys/647d9bddabc9190008a240ae
😎 Deploy Preview	https://deploy-preview-667--admiring-bhabha-7b1be9.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site settings.