Revise Microsoft Defender Threat Intelligence API documentation

[prtanej]

Updated the title, description, author, and date for the Microsoft Threat Intelligence API documentation post MDTI value convergence in Defender.

Important

Use the AI-powered workflow for Graph onboarding to author and self-review schema-related changes. See https://aka.ms/msgraphcdk for more information.

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

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Add other supporting information, such as a description of the PR changes:

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[learn-build-service-prod]

Learn Build status updates of commit f48dd73:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
api-reference/v1.0/resources/security-threatintelligence-overview.md	⚠️Warning		Details

api-reference/v1.0/resources/security-threatintelligence-overview.md

• Line 4, Column 9: [Warning: author-not-found - See documentation] Invalid value for author: 'prtanej-microsoft' is not a valid GitHub ID.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

[learn-build-service-prod]

Learn Build status updates of commit afd8814:

✅ Validation status: passed

File	Status	Preview URL	Details
api-reference/v1.0/resources/security-threatintelligence-overview.md	✅Succeeded

For more details, please refer to the build report.

[prtanej]

#sign-off