Reference the signInWithRedirect best practices in docs

[prameshj]

@sam-gc @hsubox76

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Latest commit: 4bbf432

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[google-oss-bot]

Size Report ¹

Affected Products

No changes between base commit (1455bfa) and merge commit (b709f6e).

Test Logs

• Base (1455bfa): https://github.com/firebase/firebase-js-sdk/actions/runs/3833118970
• Merge (b709f6e): https://github.com/firebase/firebase-js-sdk/actions/runs/3858706887

1. https://storage.googleapis.com/firebase-sdk-metric-reports/kElgYf9JbQ.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

No changes between base commit (1455bfa) and merge commit (b709f6e).

Test Logs

• Base (1455bfa): https://github.com/firebase/firebase-js-sdk/actions/runs/3833118970
• Merge (b709f6e): https://github.com/firebase/firebase-js-sdk/actions/runs/3858706887

1. https://storage.googleapis.com/firebase-sdk-metric-reports/N4wXMGs69y.html