media: intro.rst: don't assume audio and video codecs to be MPEG2

Originally, when DVB was introduced, all codecs would be part of
MPEG2 standard. That's not true anymore, as there are a large
number of codec standards used on digital TV nowadays.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
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