Fix broken links to tabs examples

modified examples subsection of tabs design pattern section in aria-practices.html:
The href attributes of the two links to tabs examples  were missing the "tabs" subdirectory in their path.

aria-practices.html

@@ -1835,8 +1835,8 @@ <h4>WAI-ARIA Roles, States, and Properties</h4>
       <section class="notoc">
         <h4>Examples</h4>
         <ul>
-          <li><a href="examples/tabs-1/tabs.html">Tabs With Automatic Activation</a>: A tabs widget where tabs are automatically activated and their panel is displayed when they receive focus.</li>
-          <li><a href="examples/tabs-2/tabs.html">Tabs With Manual Activation</a>: A tabs widget where users activate a tab and display its panel by pressing <kbd>Space</kbd> or <kbd>Enter</kbd>.</li>
+          <li><a href="examples/tabs/tabs-1/tabs.html">Tabs With Automatic Activation</a>: A tabs widget where tabs are automatically activated and their panel is displayed when they receive focus.</li>
+          <li><a href="examples/tabs/tabs-2/tabs.html">Tabs With Manual Activation</a>: A tabs widget where users activate a tab and display its panel by pressing <kbd>Space</kbd> or <kbd>Enter</kbd>.</li>
         </ul>
       </section>
     </section>