Merge pull request jashkenas#2161 from smelnikov/result-doc-fix

described correct behavior of _.result in docs

index.html

@@ -1931,8 +1931,8 @@ <h2 id="utility">Utility Functions</h2>
         <br />
         If the value of the named <b>property</b> is a function then invoke it
         with the <b>object</b> as context; otherwise, return it. If a default value
-        is provided and the property doesn't exist than the default will be returned.
-        If <tt>defaultValue</tt> is a function its result will be returned.
+        is provided and the property doesn't exist or is undefined than the default
+        will be returned. If <tt>defaultValue</tt> is a function its result will be returned.
       </p>
       <pre>
 var object = {cheese: 'crumpets', stuff: function(){ return 'nonsense'; }};