Update auth-initial-setup.md

[johnbhiggins7]

SHA-1 key command incorrect

Description

Provide a brief overview of what this documentation update is about. Explain what sections or topics are being added or revised.

Linear ticket and magic word Fixes DEVR-XXX

Type of change

• [ ] Typo fix
• [ ] New feature
• [ ] Enhancement to current docs
• [ ] Removed outdated references
• [ ] Update assets

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