fix: correct typo in biometric-ed25519 readme file

[microchipgnu]

it's simple work, but it's honest.

Pre-flight checklist

• I have read the Contributing Guidelines on pull requests.
• Commit messages follow the conventional commits spec

Motivation

It's a simple typo fix.

[changeset-bot]

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Latest commit: c6dedc7

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[frol]

Thank you!