fix: update authN component config docs to new syntax

[achrinza]

Supersedes https://github.com/loopbackio/loopback-next/pull/8064

Signed-off-by: Rifa Achrinza [email protected]

Checklist

• [ ] DCO (Developer Certificate of Origin) signed in all commits
• [ ] npm test passes on your machine
• [ ] New tests added or existing tests modified to cover all changes
• [ ] Code conforms with the style guide
• [ ] API Documentation in code was updated
• [ ] Documentation in /docs/site was updated
• [ ] Affected artifact templates in packages/cli were updated
• [ ] Affected example projects in examples/* were updated

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