[FTF-451] Updates chat swift getting started guide to use more performant lookup

[umair-ably]

Description

Updates chat swift getting started guide to use more performant lookup

Checklist

• Commits have been rebased.
• Linting has been run against the changed file(s).
• The PR adheres to the writing style guide and contribution guide.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch FTF-451

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[vladvelici]

serial instead of id?

[umair-ably]

updated