Further modernize lint documentation

Summary: Ref T2039. Contains a small amount of wishful thinking, I'll note it inline.

Test Plan: Generated and read documentation.

Reviewers: btrahan, avive, joshuaspence

Reviewed By: joshuaspence

Subscribers: epriestley, avivey

Maniphest Tasks: T2039

Differential Revision: https://secure.phabricator.com/D9061