Update rooms-release-note.md

[rito2k]

Delete 3 duplicated entries under changes introduced for v4.19.82.0

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

Learn Build status updates of commit 8b9f3ae:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
Teams/rooms/rooms-release-note.md	:white_check_mark:Succeeded

For more details, please refer to the build report.

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[MSTonySmith]

Fixed by PM.