Convert phutil_render_tag(X, Y) to phutil_tag

Summary:
Created with spatch:

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

(and null manually)

Test Plan: Loaded homepage

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4500
Convert phutil_render_tag(X, Y, phutil_escape_html(Z)) to phutil_tag

Summary:
Created with spatch:

  lang=diff
  - phutil_render_tag
  + phutil_tag
    (X, Y,
  - phutil_escape_html(
    Z
  - )
    )

Test Plan: Loaded homepage

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4501