Document broadcast messages in UI
What does this MR do?
The broadcast messages UI has never been documented.
This fixes that.
Related issues
Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/45801.
Author's checklist
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Apply the correct labels and milestone -
Crosslink the document from the higher-level index -
Port the MR to EE (or backport from CE): https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/9248.
Review checklist
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PM's review (recommended, but not a blocker) -
Technical writer's review (required) -
Merge the EE-MR first (https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/9248), CE-MR afterwards
Edited by Marcia Ramos