R1:20768d65d566

Convert phutil_render_tag(X, Y, '...') to phutil_tag

Summary:
Created with spatch:

lang=diff
- phutil_render_tag
+ phutil_tag
(X, Y, '...')

Then searched for `&` and `<` in the output and replaced them.

Test Plan: Loaded homepage.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4503