Fixed new function name

Author: ADmad

en/appendices/2-1-migration-guide.rst

@@ -238,8 +238,8 @@ HtmlHelper
  an array. This gives more control and flexibility over the first crumb link.
 - :php:meth:`HtmlHelper::docType()` now defaults to html5.
 - :php:meth:`HtmlHelper::image()` now has a ``fullBase`` option.
-- :php:meth:`HtmlHelper::video()` has been added. You can use this method to
- create HTML5 video elements.
+- :php:meth:`HtmlHelper::media()` has been added. You can use this method to
+ create HTML5 audio/video elements.
 - :term:`plugin syntax` support has been added for
  :php:meth:`HtmlHelper::script()`, :php:meth:`HtmlHelper::css()`, :php:meth:`HtmlHelper::image()`.
  You can now easily link to plugin assets using ``Plugin.asset``.