Document new -mp option in iOS App Wrapper for Intune MAM settings

[tgrabowski2]

Add -mp option for merging custom MAM settings into wrapped app.

[prmerger-automator]

@tgrabowski2 : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[github-actions]

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[learn-build-service-prod]

Learn Build status updates of commit 3bdffb2:

✅ Validation status: passed

File	Status	Preview URL	Details
intune/intune-service/developer/app-wrapper-prepare-ios.md	✅Succeeded

For more details, please refer to the build report.