Add ARIA attribute to breadcrumbs example

Author: philwareham

src/docs/design-patterns.html

@@ -764,7 +764,7 @@ <h2>Breadcrumbs</h2>
                                 </li>
                                 <li class="current" itemprop="itemListElement" itemscope itemtype="https://schema.org/ListItem">
                                     <b itemprop="item">
-                                        <span itemprop="name">Test subject X11</span>
+                                        <span itemprop="name" aria-current="location">Test subject X11</span>
                                     </b>
                                     <meta itemprop="position" content="4">
                                 </li>