Alphabetize .arclint linters

Summary: I'm a bit OCD with this, but I find the .arclint file easier to read if the keys are in alphabetical order.

Test Plan: N/A

Reviewers: Blessed Reviewers, epriestley

Reviewed By: Blessed Reviewers, epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9802