Fixed change notification event types

[AlessioCarminati]

Changed the event type property values based on the real event types that are returned in the payloads.

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Required for API changes:

• Link to API.md file: ADD LINK HERE
• Link to PR for public-facing schema changes (schema-Prod-beta/v1.0.csdl): ADD LINK HERE

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[learn-build-service-prod]

Learn Build status updates of commit d62c06a:

✅ Validation status: passed

File	Status	Preview URL	Details
concepts/changenotifications-for-onlinemeeting.md	✅Succeeded

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[Danielabom]

@AlessioCarminati, friendly reminder to please add the "ready for content review" label, if you're ready for a content reviewer to take your PR. Thanks!

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