Add Methods section to Popovers nav menu in docs

[skip sauce]

Author: cvrebert

docs/_includes/js/popovers.html

@@ -248,7 +248,7 @@ <h4>Data attributes for individual popovers</h4>
     <p>Options for individual popovers can alternatively be specified through the use of data attributes, as explained above.</p>
   </div>
 
-  <h3>Methods</h3>
+  <h3 id="popovers-methods">Methods</h3>
   <h4><code>$().popover(options)</code></h4>
   <p>Initializes popovers for an element collection.</p>
 

docs/_includes/nav/javascript.html

@@ -69,6 +69,7 @@
     <li><a href="#popovers-examples">Examples</a></li>
     <li><a href="#popovers-usage">Usage</a></li>
     <li><a href="#popovers-options">Options</a></li>
+    <li><a href="#popovers-methods">Methods</a></li>
     <li><a href="#popovers-events">Events</a></li>
   </ul>
 </li>