help: Document @ topic mentions.

Documents new wildcard mention for topic participants updating
and making tweaks to all relevant pages.

Fixes #27657.

Co-authored-by: Alya Abbott <alya@zulip.com>
This commit is contained in:
David Rosa
2023-11-13 22:06:22 -08:00
committed by Tim Abbott
parent d87f47412b
commit 21aa5d261a
5 changed files with 35 additions and 12 deletions

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