Link and summarize methods in the "Tasks" view of a Diviner class

Summary: Ref T988. Make this more useful, and link it to the methods it describes.

Test Plan:
Before:

{F57553}

After:

{F57554}

Reviewers: chad

Reviewed By: chad

CC: aran

Maniphest Tasks: T988

Differential Revision: https://secure.phabricator.com/D6909