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Note extra mailing list settings in documentation

Description

Note extra mailing list settings in documentation

Summary: Ref T8387. Just mention this stuff since it's moderately useful.

Test Plan: Read.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T8387

Differential Revision: https://secure.phabricator.com/D13139