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/diffusion/controller/DiffusionRepositoryEditMainController.php

@@ -294,7 +294,8 @@ final class DiffusionRepositoryEditMainController
       $this->buildRepositoryUpdateInterval($repository));
 
     $description = $repository->getDetail('description');
-    $view->addSectionHeader(pht('Description'));
+    $view->addSectionHeader(
+      pht('Description'), PHUIPropertyListView::ICON_SUMMARY);
     if (!strlen($description)) {
       $description = phutil_tag('em', array(), pht('No description provided.'));
     } else {