Examples: Make use of the `footer` tag instead of a `div`.

docs/examples/blog/index.html

@@ -156,12 +156,12 @@
 
     </div><!-- /.container -->
 
-    <div class="blog-footer">
+    <footer class="blog-footer">
       <p>Blog template built for <a href="http://getbootstrap.com">Bootstrap</a> by <a href="https://twitter.com/mdo">@mdo</a>.</p>
       <p>
         <a href="#">Back to top</a>
       </p>
-    </div>
+    </footer>
 
 
     <!-- Bootstrap core JavaScript

docs/examples/jumbotron-narrow/index.html

@@ -69,9 +69,9 @@
         </div>
       </div>
 
-      <div class="footer">
+      <footer class="footer">
         <p>&copy; Company 2014</p>
-      </div>
+      </footer>
 
     </div> <!-- /container -->
 

docs/examples/justified-nav/index.html

@@ -71,9 +71,9 @@
       </div>
 
       <!-- Site footer -->
-      <div class="footer">
+      <footer class="footer">
         <p>&copy; Company 2014</p>
-      </div>
+      </footer>
 
     </div> <!-- /container -->
 

docs/examples/sticky-footer-navbar/index.html

@@ -72,11 +72,11 @@
       <p>Back to <a href="../sticky-footer">the default sticky footer</a> minus the navbar.</p>
     </div>
 
-    <div class="footer">
+    <footer class="footer">
       <div class="container">
         <p class="text-muted">Place sticky footer content here.</p>
       </div>
-    </div>
+    </footer>
 
 
     <!-- Bootstrap core JavaScript

docs/examples/sticky-footer/index.html

@@ -38,11 +38,11 @@
       <p>Use <a href="../sticky-footer-navbar">the sticky footer with a fixed navbar</a> if need be, too.</p>
     </div>
 
-    <div class="footer">
+    <footer class="footer">
       <div class="container">
         <p class="text-muted">Place sticky footer content here.</p>
       </div>
-    </div>
+    </footer>
 
 
     <!-- IE10 viewport hack for Surface/desktop Windows 8 bug -->