[ci skip] Fix some spaces
diff --git a/system/database/DB_forge.php b/system/database/DB_forge.php
index fd224c4..5c782f8 100644
--- a/system/database/DB_forge.php
+++ b/system/database/DB_forge.php
@@ -229,7 +229,7 @@
 	 *
 	 * @param	string	$key
 	 * @param	bool	$primary
-	 * @return  CI_DB_forge
+	 * @return	CI_DB_forge
 	 */
 	public function add_key($key = '', $primary = FALSE)
 	{