Update ios-install.md

[kerodri]

trafficstars

needs to be specific on what license is needed

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

Learn Build status updates of commit a90adea:

:warning: Validation status: warnings

File	Status	Preview URL	Details
microsoft-365/security/defender-endpoint/ios-install.md	:warning:Warning		Details

microsoft-365/security/defender-endpoint/ios-install.md

• Line 41, Column 110: [Warning: disallowed-html-tag - See documentation] HTML tag 'specify' isn't allowed. Replace it with approved Markdown or escape the brackets if the content is a placeholder.

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[Dansimp]

Will review and update in a separate PR