R1:4cc006f8afe2

Fix Remarkup doc issue with #'s

Summary:
The `##` on the beginning of a line is now a header.

Use more-preferred backticks.

Test Plan: nope lol

Reviewers: joshuaspence

Reviewed By: joshuaspence

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D10157