Update _.flip doc example and test to better show effect.

lodash.js

@@ -7489,8 +7489,8 @@
      *   return _.toArray(arguments);
      * });
      *
-     * flipped('a', 'b', 'c')
-     * // => ['c', 'b', 'a']
+     * flipped('a', 'b', 'c', 'd');
+     * // => ['d', 'c', 'b', 'a']
      */
     function flip(func) {
       return createWrapper(func, FLIP_FLAG);

test/test.js

@@ -4674,7 +4674,7 @@
       assert.expect(1);
 
       var flipped = _.flip(fn);
-      assert.deepEqual(flipped('a', 'b', 'c'), ['c', 'b', 'a']);
+      assert.deepEqual(flipped('a', 'b', 'c', 'd'), ['d', 'c', 'b', 'a']);
     });
   }());