docs(auth): fix docs render issue in AuthSettings

[mikehardy]

Description

unterminated tag was breaking Vercel docs build, I should have caught that on the PR review, it was obvious in hindsight

Related issues

Fixes #7166
Originally caused by #7148 but obviously not on purpose, it was a trivial error that correctly triggered status failures etc

Release Summary

no package release, just a docs change, but Vercel will build + deploy which is all I want

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
• My change includes tests;
  • e2e tests added or updated in packages/\*\*/e2e
  • jest tests added or updated in packages/\*\*/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

Test Plan

Run of cd website && yarn then repeats of yarn build with some instrumentation until I located the issue

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Name	Status	Preview	Comments	Updated (UTC)
react-native-firebase	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 27, 2023 1:31am

1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
react-native-firebase-next	⬜️ Ignored (Inspect)			Jun 27, 2023 1:31am

[mikehardy]

Vercel built! Yes. This does not effect iOS or Android and those are the only 2 checks left. As those are unimportant for this PR I'm merging so our docs site is up to date (with new realtime remote-config info...)