Update steam docs to mention TOTP

[davidmfinol]

Changes

• Update steam docs to mention TOTP

Checklist

• [x] Read the contribution guide and accept the code of conduct
• [x] Readme (updated or not needed)
• [x] Tests (added, updated or not needed)

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Visit the preview URL for this PR (updated for commit fb7f8d1):

https://game-ci-5559f--pr375-davidmfinol-patch-2-uthglo8b.web.app

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