Replace some hsprintf() by phutil_tag()

Test Plan: Looked at a diff with inline comment.

Reviewers: epriestley

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D7549

src/applications/system/PhabricatorDebugController.php

@@ -28,7 +28,7 @@ final class PhabricatorDebugController extends PhabricatorController {
     $out = ob_get_clean();
 
     $response = new AphrontWebpageResponse();
-    $response->setContent(hsprintf('<pre>%s</pre>', $out));
+    $response->setContent(phutil_tag('pre', array(), $out));
     return $response;
   }