R1:dba984bd87f2

Fix bad rendering for custom policy descriptions

Summary: This call got renamed but I missed the callsite.

Test Plan: No more fatal when viewing a custom policy from a transaction history page.

Reviewers: btrahan, chad, Mnkras

Reviewed By: chad, Mnkras

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D12337