Added a link to the findAll .lock options docs

lib/model.js

@@ -643,6 +643,7 @@ module.exports = (function() {
    * @param  {Number}                    [options.offset]
    * @param  {Object}                    [queryOptions] Set the query options, e.g. raw, specifying that you want raw data instead of built Instances. See sequelize.query for options
    * @param  {Transaction}               [queryOptions.transaction]
+   * @param  {String}                    [queryOptions.lock] Lock the selected rows in either share or update mode. Possible options are transaction.LOCK.UPDATE and transaction.LOCK.SHARE. See [transaction.LOCK for an example](https://github.com/sequelize/sequelize/wiki/API-Reference-Transaction#LOCK)
    *
    * @see    {Sequelize#query}
    * @return {Promise<Array<Instance>>}