R1:b4d03bb26c61

Remove side spacing on code remarkup

Summary: Sets everything up flush, I think this is the only indented block left.

Test Plan:
Write some code.

{F289438}

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley, #design

Differential Revision: https://secure.phabricator.com/D11721