Parse inline comments via remarkup engine
Summary: Inline comments weren't haven't remarkup applied. Fixes T3137
Test Plan: Added some inline comments, checked that they had remarkup applied. Also checked in the real time preview.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin
Maniphest Tasks: T3137
Differential Revision: https://secure.phabricator.com/D6024