typo in storage message

Test Plan:
I didn't put any skill points in spelling since I need
combat skills to survive in a nuclear wasteland, but spell check says
this is better.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D14522

Author: cburroughs

src/infrastructure/storage/management/workflow/PhabricatorStorageManagementWorkflow.php

@@ -633,7 +633,7 @@ private function printErrors(array $errors, $default_return) {
       if ($any_surplus) {
         $message[] = pht(
           'Some of these errors are caused by surplus schemata (extra '.
-          'tables or columsn which Phabricator does not expect). These are '.
+          'tables or columns which Phabricator does not expect). These are '.
           'not serious. For information on resolving these issues, see the '.
           '"Surplus Schemata" section in the "Managing Storage Adjustments" '.
           'article in the documentation.');