DOC-3243: TinyMCE 8.4.0 Release Documentation and Community Changelog. #4040

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Task	Status
Branch prefixed with `feature/<version>/`, `hotfix/<version>/`, `staging/<version>/`, or `release/<version>/`.	Completed
`modules/ROOT/nav.adoc` has been updated `(if applicable)`.	Completed
Included a `release note` entry for any `New product features`.	Completed
If this is a minor release, updated `productminorversion` in `antora.yml` and added new supported versions entry in `modules/ROOT/partials/misc/supported-versions.adoc`.	Completed
`api-version` bump to 8.4.0	Completed
Documentation Team Lead has reviewed	Completed