[Excel PowerPoint Word] (devx) clarify add-in only manifest markup for COM/VSTO/Web add-in compatibility

[Rick-Kirkham]

Fixes 5432

[learn-build-service-prod]

Learn Build status updates of commit 9ebbcb1:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/develop/make-office-add-in-compatible-with-existing-com-add-in.md	✅Succeeded	View

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[learn-build-service-prod]

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