Update API documentation for security incident

[LeonardoMele-MSFT]

Updated the incident update API documentation with new author and date. Modified example response to reflect changes in incident properties.

Important

Required for API changes:

• [] Link to API.md file: ADD LINK HERE
• [] Link to PR for public-facing schema changes (schema-Prod-beta/v1.0.csdl): ADD LINK HERE
• [] OPTIONAL: Attach the documentation plan generated for AI-assisted docs authoring and validation to help speed up content review.

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[learn-build-service-prod]

Learn Build status updates of commit bce39ea:

✅ Validation status: passed

File	Status	Preview URL	Details
api-reference/v1.0/api/security-incident-update.md	✅Succeeded

For more details, please refer to the build report.

[learn-build-service-prod]

Learn Build status updates of commit bce39ea:

✅ Validation status: passed

File	Status	Preview URL	Details
api-reference/v1.0/api/security-incident-update.md	✅Succeeded

For more details, please refer to the build report.

[LeonardoMele-MSFT]

#feedback-addressed

[FaithOmbongi]

@LeonardoMele-MSFT - Heads up: As a Microsoft employee, please make all contributions in the private repo. I'll merge this PR for now.

[LeonardoMele-MSFT]

@LeonardoMele-MSFT - Heads up: As a Microsoft employee, please make all contributions in the private repo. I'll merge this PR for now.

Hello @FaithOmbongi, thank you for approving my pull requests. Starting next time, I will create them in the private repository. When will the merge become effective? The changes are not being reflected yet. Thank you very much.