Make icon setting in Section Headers easier/consistent

Summary: You can already pass other icons, but this makes it a bit simpler.

Test Plan: Test Maniphest, Badges

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D14131

src/applications/badges/controller/PhabricatorBadgesViewController.php

@@ -109,7 +109,8 @@ final class PhabricatorBadgesViewController
         'default',
         $viewer);
 
-      $view->addSectionHeader(pht('Description'));
+      $view->addSectionHeader(
+        pht('Description'), PHUIPropertyListView::ICON_SUMMARY);
       $view->addTextContent($description);
     }