docs: fix a typo in relay_feature_store

[idosal]

Requirements

• [ ] I have added test coverage for new or changed functionality
• [ ] I have followed the repository's pull request submission guidelines
• [ ] I have validated my changes against all supported platform versions

Related issues

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Describe the solution you've provided

Removed the first instance of the duplicate comment string (but also publish)

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Additional context

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[keelerm84]

Thank you for your contribution!