R1:7e822fc94fa3

Update PhrictionContent for modular transactions

Summary: Fixes T12625. Moves TYPE_CONTENT in Phriction over to modular transactions.

Test Plan: Edit some documents.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T12625

Differential Revision: https://secure.phabricator.com/D18000