Change double quotes to single quotes.

Summary: Ran `arc lint --apply-patches --everything` over rP, mainly to change double quotes to single quotes where appropriate. These changes also validate that the `ArcanistXHPASTLinter::LINT_DOUBLE_QUOTE` rule is working as expected.

Test Plan: Eyeballed it.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley, Korvin, hach-que

Differential Revision: https://secure.phabricator.com/D9431

src/applications/auth/controller/PhabricatorAuthConfirmLinkController.php

@@ -58,8 +58,8 @@ final class PhabricatorAuthConfirmLinkController
             'class' => 'aphront-form-instructions',
           ),
           pht(
-            "Confirm the link with this %s account. This account will be ".
-            "able to log in to your Phabricator account.",
+            'Confirm the link with this %s account. This account will be '.
+            'able to log in to your Phabricator account.',
             $provider->getProviderName())))
       ->appendChild(
         id(new PhabricatorAuthAccountView())