Rectify malformed image syntax

[Rageking8]

Fix 2 instances where the image syntax is incorrect, which either causes stray colons to be rendered, or the whole image not being rendered.

[learn-build-service-prod]

Learn Build status updates of commit f3a3f73:

✅ Validation status: passed

File	Status	Preview URL	Details
defender-office-365/configuration-analyzer-for-security-policies.md	✅Succeeded
defender-vulnerability-management/tvm-certificate-inventory.md	✅Succeeded

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[denisebmsft]

Thank you @Rageking8