Fixes for the Favicon pattern docs

docs/patterns/favicon.rst

@@ -17,7 +17,7 @@ tag in your HTML. So, for example:
 
 .. sourcecode:: html+jinja
 
-    <link rel="shortcut icon" href="{{ url_for('static', filename='favicon.ico') }}">
+    <link rel="shortcut icon" href="{{ url_for('.static', filename='favicon.ico') }}">
 
 That's all you need for most browsers, however some really old ones do not
 support this standard. The old de-facto standard is to serve this file,
@@ -26,8 +26,9 @@ the root path of the domain you either need to configure the webserver to
 serve the icon at the root or if you can't do that you're out of luck. If
 however your application is the root you can simply route a redirect::
 
-    app.add_url_rule('/favicon.ico',
+    @app.route('/favicon.ico')
-                     redirect_to=url_for('static', filename='favicon.ico'))
+    def favicon():
+        return redirect(url_for('.static', filename='favicon.ico'))
 
 If you want to save the extra redirect request you can also write a view
 using :func:`~flask.send_from_directory`::