#42000, docs update, by me

includes/database.inc

@@ -96,7 +96,7 @@ function db_prefix_tables($sql) {
  *   The name assigned to the newly active database connection. If omitted, the
  *   default connection will be made active.
  *
- * @return the name of the 
+ * @return the name of the previously active database or FALSE if non was found.
  */
 function db_set_active($name = 'default') {
   global $db_url, $db_type, $active_db;