documented the missing argument

loopback/util/log.js

@@ -2,6 +2,7 @@
  * Translates to a readable values
  * @param {Object} instance - The model or context instance
  * @param {Object} changes - Object containing changes
+ * @param {Object} options - Object containing transaction
  */
 exports.translateValues = async(instance, changes, options = {}) => {
     const models = instance.app.models;