Link Herald rules to rule detail pages in Herald transcripts

Summary: Fixes T9410. Depends on D16382. Since all users can now view all Herald rules, we can link them in the transcripts.

Test Plan: Viewed a transcript, clicked rule names, reviewed rules.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9410

Differential Revision: https://secure.phabricator.com/D16383