fix typo in comments
diff --git a/system/database/DB_driver.php b/system/database/DB_driver.php
index dd93abc..a0803f1 100644
--- a/system/database/DB_driver.php
+++ b/system/database/DB_driver.php
@@ -1643,7 +1643,7 @@
 	/**
 	 * Close DB Connection
 	 *
-	 * This method would be overriden by most of the drivers.
+	 * This method would be overridden by most of the drivers.
 	 *
 	 * @return	void
 	 */