[media] DocBook media: fix broken EIA hyperlink

This fixes the bibliography hyperlink to "http://www.eia.org"
which now redirects to a page with a "404 Not found" error.

The latest update to the document referred to is now available
on the Consumer Electronics Association website.

Signed-off-by: Michael Opdenacker <michael.opdenacker@free-electrons.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>