Update network-protection-macos.md

[ericlaw1979]

Improve MacOS NP instructions, including links to policy resources.

[learn-build-service-prod]

Learn Build status updates of commit 7844a99:

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[learn-build-service-prod]

Learn Build status updates of commit 7d5657b:

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[denisebmsft]

Thank you for the pull request, @ericlaw1979

[learn-build-service-prod]

Learn Build status updates of commit 6c3f728:

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[learn-build-service-prod]

Learn Build status updates of commit 1c7e80a:

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defender-endpoint/network-protection-macos.md	✅Succeeded

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[learn-build-service-prod]

Learn Build status updates of commit b2ce4f9:

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defender-endpoint/network-protection-macos.md	✅Succeeded

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