Make a PhabricatorRemarkupControl to de-duplicate code usage around adding a Remarkup reference to a TextAreaControl.

Summary: ...also makes Maniphest Task Edit Controller use this when its not appropriate to upsell email.

Test Plan: played around with each tool and verified the Remarkup reference was present

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T1756

Differential Revision: https://secure.phabricator.com/D3468

src/applications/ponder/controller/PonderQuestionAskController.php

@@ -100,20 +100,11 @@ final class PonderQuestionAskController extends PonderController {
           ->setName('title')
           ->setValue($title))
       ->appendChild(
-        id(new AphrontFormTextAreaControl())
+        id(new PhabricatorRemarkupControl())
           ->setName('content')
           ->setID('content')
           ->setValue($content)
-          ->setLabel("Question")
-          ->setCaption(phutil_render_tag(
-            'a',
-            array(
-              'href' => PhabricatorEnv::getDoclink(
-                'article/Remarkup_Reference.html'),
-              'tabindex' => '-1',
-              'target' => '_blank',
-            ),
-            "Formatting Reference")))
+          ->setLabel("Question"))
       ->appendChild(
         id(new AphrontFormSubmitControl())
         ->setValue('Ask Away!'));