fixed typo

lib/Doctrine/Connection.php

@@ -102,9 +102,9 @@ abstract class Doctrine_Connection extends Doctrine_Configurable implements Coun
      */
     protected $serverInfo = array();
     /**
-     * @var array $availibleDrivers         an array containing all availible drivers
+     * @var array $availableDrivers         an array containing all availible drivers
      */
-    private static $availibleDrivers    = array(
+    private static $availableDrivers    = array(
                                         'Mysql',
                                         'Pgsql',
                                         'Oracle',