Remove "Editable By" description fields in Passphrase, Phame, and Spaces

Summary:
Ref T13411. These three applications render an "Editable By: <policy>" field in their descriptions.

The pages that these appear on all have "Edit <thing>" actions which either tell you the policy or allow you to discover the policy, and this field is unusual (the vast majority of objects don't have it). I think it largely got copy/pasted or used as space-filler and doesn't offer much of value.

Remove it to simplify/standardize these pages and make changes to how this field works simpler to implement.

Test Plan: Viewed a Credential, Blog, and Space; no longer saw the "Editable By" field.

Maniphest Tasks: T13411

Differential Revision: https://secure.phabricator.com/D20802

src/applications/passphrase/controller/PassphraseCredentialViewController.php

@@ -190,14 +190,6 @@ final class PassphraseCredentialViewController extends PassphraseController {
       pht('Credential Type'),
       $type->getCredentialTypeName());
 
-    $descriptions = PhabricatorPolicyQuery::renderPolicyDescriptions(
-      $viewer,
-      $credential);
-
-    $properties->addProperty(
-      pht('Editable By'),
-      $descriptions[PhabricatorPolicyCapability::CAN_EDIT]);
-
     if ($type->shouldRequireUsername()) {
       $properties->addProperty(
         pht('Username'),

src/applications/phame/controller/blog/PhameBlogManageController.php

@@ -143,14 +143,6 @@ final class PhameBlogManageController extends PhameBlogController {
         ),
         $feed_uri));
 
-    $descriptions = PhabricatorPolicyQuery::renderPolicyDescriptions(
-      $viewer,
-      $blog);
-
-    $properties->addProperty(
-      pht('Editable By'),
-      $descriptions[PhabricatorPolicyCapability::CAN_EDIT]);
-
     $engine = id(new PhabricatorMarkupEngine())
       ->setViewer($viewer)
       ->addObject($blog, PhameBlog::MARKUP_FIELD_DESCRIPTION)

src/applications/spaces/controller/PhabricatorSpacesViewController.php

@@ -80,14 +80,6 @@ final class PhabricatorSpacesViewController
         ? pht('Yes')
         : pht('No'));
 
-    $descriptions = PhabricatorPolicyQuery::renderPolicyDescriptions(
-      $viewer,
-      $space);
-
-    $list->addProperty(
-      pht('Editable By'),
-      $descriptions[PhabricatorPolicyCapability::CAN_EDIT]);
-
     $description = $space->getDescription();
     if (strlen($description)) {
       $description = new PHUIRemarkupView($viewer, $description);