Update defender-advanced-threat-protection.md

[gowdhamankarthikeyan]

[prmerger-automator[bot]]

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[learn-build-service-prod[bot]]

Learn Build status updates of commit 2db14b1:

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[gowdhamankarthikeyan]

#sign-off

[prmerger-automator[bot]]

Invalid command: '#sign-off'. Only the assigned author of one or more file in this PR can sign off. @BalaDelli

[BalaDelli]

#sign-off

[gowdhamankarthikeyan]

#sign-off

[prmerger-automator[bot]]

Invalid command: '#sign-off'. Only the assigned author of one or more file in this PR can sign off. @BalaDelli

[dougeby]

This was signed-off on but not merged. Merging.