[ci skip] Mention how to access the original sequelize methods when overriding c…

…lass and instance methods. Closes #2091

lib/sequelize.js

@@ -374,8 +374,8 @@ module.exports = (function() {
    * @param {String}                  [options.tableName] Defaults to pluralized model name, unless freezeTableName is true, in which case it uses model name verbatim
    * @param {String}                  [options.tableName] Defaults to pluralized model name, unless freezeTableName is true, in which case it uses model name verbatim
    * @param {Object}                  [options.getterMethods] Provide getter functions that work like those defined per column. If you provide a getter method with the same name as a column, it will be used to access the value of that column. If you provide a name that does not match a column, this function will act as a virtual getter, that can fetch multiple other values
    * @param {Object}                  [options.getterMethods] Provide getter functions that work like those defined per column. If you provide a getter method with the same name as a column, it will be used to access the value of that column. If you provide a name that does not match a column, this function will act as a virtual getter, that can fetch multiple other values
    * @param {Object}                  [options.setterMethods] Provide setter functions that work like those defined per column. If you provide a setter method with the same name as a column, it will be used to update the value of that column. If you provide a name that does not match a column, this function will act as a virtual setter, that can act on and set other values, but will not be persisted
    * @param {Object}                  [options.setterMethods] Provide setter functions that work like those defined per column. If you provide a setter method with the same name as a column, it will be used to update the value of that column. If you provide a name that does not match a column, this function will act as a virtual setter, that can act on and set other values, but will not be persisted
-   * @param {Object}                  [options.instanceMethods] Provide functions that are added to each instance (DAO)
-   * @param {Object}                  [options.classMethods] Provide functions that are added to the model (Model)
+   * @param {Object}                  [options.instanceMethods] Provide functions that are added to each instance (DAO). If you override methods provided by sequelize, you can access the original method using `this.constructor.super_.prototype`, e.g. `this.constructor.super_.prototype.toJSON.apply(this, arguments)`
+   * @param {Object}                  [options.classMethods] Provide functions that are added to the model (Model). If you override methods provided by sequelize, you can access the original method using `this.constructor.prototype`, e.g. `this.constructor.prototype.find.apply(this, arguments)`
    * @param {String}                  [options.schema='public']
    * @param {String}                  [options.schema='public']
    * @param {String}                  [options.engine]
    * @param {String}                  [options.engine]
    * @param {String}                  [options.charset]
    * @param {String}                  [options.charset]