Convert phutil_render_tag() to phutil_tag() for inline comments

Test Plan:
Looked at file with lint errors in Diffusion.

I've also tried inline comments in Differential but it failed.
I'll try it again after you land all your diffs.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T2432

Differential Revision: https://secure.phabricator.com/D4755