Should we keep mentioning when `/zoom` has been introduced?

The following discussion from !17787 (merged) should be addressed:

• @splattael started a discussion:

  Should we keep mentioning when this feature has been introduced? 🤔

  ([Introduced in GitLab 12.4](https://gitlab.com/gitlab-org/gitlab/merge_requests/16609).

  This we can resolve an in follow-up issue 👍