Corrected the spelling of 'maintenance' in comment block

app/start/global.php

@@ -60,7 +60,7 @@ App::error(function(Exception $exception, $code)
 |
 | The "down" Artisan command gives you the ability to put an application
 | into maintenance mode. Here, you will define what is displayed back
-| to the user if maintenace mode is in effect for this application.
+| to the user if maintenance mode is in effect for this application.
 |
 */
 
@@ -80,4 +80,4 @@ App::down(function()
 |
 */
 
-require app_path().'/filters.php';
+require app_path().'/filters.php';