Correct ARIA attribute

Author: philwareham

src/docs/design-patterns.html

@@ -718,7 +718,7 @@ <h2>Pagination</h2>
                                     <a href="#" title="Go to page 1" aria-label="Go to page 1">1</a>
                                 </li>
                                 <li class="current">
-                                    <b title="Current page" aria-label="Current page">2</b>
+                                    <b title="Current page" aria-current="page">2</b>
                                 </li>
                                 <li>
                                     <a href="#" title="Go to page 3" aria-label="Go to page 3">3</a>