DOC-2571: Updated the support information for TinyMCE 6. #3508

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Task	Status
Updated the content of the support information.	Incomplete
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
Documentation Team Lead has reviewed	Completed