R1:8e1a4eef0400

T4666, Support Herald in Phriction

Summary: Fixes T4666, add Herald rules to Phriction Documents

Test Plan: add Herald rule to flag if title contains "xyz", create Phriction Document with title "xyz". Phriction Document should be flagged.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Maniphest Tasks: T4666

Differential Revision: https://secure.phabricator.com/D10830