Comments - Setting Up Replication
Content reproduced on this site is the property of its respective owners,
and this content is not reviewed in advance by MariaDB. The views, information and opinions
expressed by this content do not necessarily represent those of MariaDB or any other party.
It's an option rather than a variable, so listed at mysqld Options as well as Full List of MariaDB Options, System and Status Variables. It should be mentioned in the replication text though, so thanks for pointing that out, will incorporate it.