R1:debffb1c841b

Update doc reference to PhabricatorIRCBot for D4757

Summary: Update doc reference to PhabricatorIRCBot for D4757

Test Plan: Read the docs

Reviewers: indiefan, epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11098