Fix MD typo in device-discovery-faq.md

[ranok]

Very small fix of the formatting for LLMR in the list of protocols used in device discovery by MS Defender for Endpoint.

[learn-build-service-prod]

Learn Build status updates of commit 974ca40:

✅ Validation status: passed

File	Status	Preview URL	Details
defender-endpoint/device-discovery-faq.md	✅Succeeded

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[denisebmsft]

Thank you @ranok