Update event-delta.md

[mitrasomit]

"...........updated since the the previous delta call."

Here "the" was duplicate.

"Ready for content review"

[learn-build-service-prod]

Learn Build status updates of commit 2bae3fc:

✅ Validation status: passed

File	Status	Preview URL	Details
api-reference/v1.0/api/event-delta.md	✅Succeeded

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[Danielabom]

@mitrasomit, please add the "ready for content review" label if you want us to continue with the review.

[mitrasomit]

@Danielabom
It seems I cannot edit the Labels. However, I have added as a comment.