Remove duplicate RTP depacketization entry.

Two questions below there is the same Q+A, slightly rephrased.

Originally committed as revision 24320 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/faq.texi

@@ -471,11 +471,6 @@ The standard MSys bash (2.04) is broken. You need to install 2.05 or later.
 
 The standard MSys install doesn't come with pr. You need to get it from the coreutils package.
 
-@section I tried to pass RTP packets into a decoder, but it doesn't work.
-
-RTP is a container format like any other, you must first depacketize the
-codec frames/samples stored in RTP and then feed to the decoder.
-
 @section Where can I find libav* headers for Pascal/Delphi?
 
 see @url{http://www.iversenit.dk/dev/ffmpeg-headers/}