Fix doc example for _.forEach. [ci skip]

lodash.src.js

@@ -5874,7 +5874,7 @@
      * @returns {Array|Object|string} Returns `collection`.
      * @example
      *
-     * _([1, 2, 3]).forEach(function(n) { console.log(n); });
+     * _([1, 2, 3]).forEach(function(n) { console.log(n); }).value();
      * // => logs each value from left to right and returns the array
      *
      * _.forEach({ 'one': 1, 'two': 2, 'three': 3 }, function(n, key) { console.log(n, key); });