Remove 404 link.

Originally committed as revision 6329 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/ffmpeg-doc.texi

@@ -825,10 +825,6 @@ following image formats are supported:
 
 @code{X} means that encoding (resp. decoding) is supported.
 
-See @url{http://mplayerhq.hu/~michael/codec-features.html} to
-get a precise comparison of the FFmpeg MPEG-4 codec compared to
-other implementations.
-
 @section Audio Codecs
 
 @multitable @columnfractions .4 .1 .1 .1 .7