build: fix up jsdoc return values

closes expressjs#2243

Author: vaseker

lib/response.js

@@ -625,7 +625,7 @@ res.get = function(field){
  *
  * @param {String} name
  * @param {Object} options
- * @param {ServerResponse} for chaining
+ * @return {ServerResponse} for chaining
  * @api public
  */
 
@@ -656,6 +656,7 @@ res.clearCookie = function(name, options){
  * @param {String} name
  * @param {String|Object} val
  * @param {Options} options
+ * @return {ServerResponse} for chaining
  * @api public
  */
 
@@ -701,6 +702,7 @@ res.cookie = function(name, val, options){
  *    res.location('../login');
  *
  * @param {String} url
+ * @return {ServerResponse} for chaining
  * @api public
  */
 
@@ -785,7 +787,7 @@ res.redirect = function redirect(url) {
  * this call is simply ignored.
  *
  * @param {Array|String} field
- * @param {ServerResponse} for chaining
+ * @return {ServerResponse} for chaining
  * @api public
  */