Update device-control-policies.md

[Mac-Chiato]

missing slash /

[learn-build-service-prod]

Learn Build status updates of commit 586b9e8:

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[denisebmsft]

Thank you @Mac-Chiato

[learn-build-service-prod]

Learn Build status updates of commit 8560f15:

✅ Validation status: passed

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[learn-build-service-prod]

Learn Build status updates of commit 2a7751e:

✅ Validation status: passed

File	Status	Preview URL	Details
defender-endpoint/device-control-policies.md	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel