Added a default _truncate() method to CI_DB_active_record
diff --git a/system/database/drivers/oci8/oci8_driver.php b/system/database/drivers/oci8/oci8_driver.php
index 65ae1ea..756d93a 100644
--- a/system/database/drivers/oci8/oci8_driver.php
+++ b/system/database/drivers/oci8/oci8_driver.php
@@ -648,8 +648,9 @@
* Truncate statement
*
* Generates a platform-specific truncate string from the supplied data
- * If the database does not support the truncate() command
- * This function maps to "DELETE FROM table"
+ *
+ * If the database does not support the truncate() command,
+ * then this method maps to 'DELETE FROM table'
*
* @param string the table name
* @return string